HomeMy WebLinkAbout233113 DUCTWORK.pdfL’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 1
SECTION 23 31 13
Ductwork
PART 1 � GENERAL
1.01 RELATED SECTIONS:
A. Drawings, general provisions of the Contract, including General and Supplementary
Conditions, and Division�1 Specification Sections and Division 20 and 23 Specification
Sections, apply to work of this Section.
1.02 DESCRIPTION OF WORK:
A. Scope of Work:
1. Furnish and install ductwork as shown or implied on the Contract Documents.
2. Extent of the work is indicated on the Drawings and in the schedules, and by
requirements of this section.
a. Low pressure ductwork is hereby defined as ductwork subjected to
velocities of less than 2500 fpm or less and operating pressure of 2”
water column (w.c.) or less, positive or negative.
B. Work Included:
1. Heating supply and return air duct systems.
2. Air conditioning supply and return duct systems.
3. Supply ducts on discharge side of mixing box.
4. Mechanical exhaust ducts.
5. Fresh air supply systems.
6. Return air runouts from trunk to register or grille.
1.03 QUALITY ASSURANCE:
A. Construction Standards:
1. All ducts shall be fabricated in accordance with SMACNA "HVAC Duct
Construction Standards”.
2. Where SMACNA standards provide no guidance, comply with ASHRAE
Handbook of Fundamentals chapter on Duct Construction.
3. Comply with ANSI/NFPA 90A “Standard for the Installation of Air�
Conditioning and Ventilating Systems” and ANSI/NFPA 90B “Standard for the
Installation of Warm Air Heating and Air�Conditioning Systems”.
4. All ductwork furnished with factory installed insulation and vapor barriers shall
be UL listed and labeled for a flame spread and smoke producing rating of 25
and 50 respectively and listed Class I.
B. Pressure Classifications:
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 2
1. Supply, return, and relief ducts in penthouses and mechanical rooms shall be
constructed to 10" water column classification.
2. All other supply ducts shall be constructed to 4" water column classification.
3. All other return air ducts shall be constructed to 3" water column classification.
1.04 SUBMITTALS:
A. Submit descriptive literature and shop drawings for manufactured products and factory
fabricated ductwork in accordance with Division 1 requirements.
B. Submit complete dimensioned layouts of ductwork showing both the accurately scaled
ductwork and its relation of space enclosure. At a minimum, the following items will be
required to be indicated on the duct layout submittals:
1. Drawings shall be submitted in AutoCAD format. Hand drawn documents are
not acceptable.
2. Ductwork layout on reflected ceiling plans to 1/4" = 1'�0" scale.
3. Fire damper and smoke damper installation and locations. Where fire dampers
and smoke dampers are located in walls and floors, provide details of
installation.
4. Access door installations and locations. Where access doors are required in
walls provide details of installation.
5. Duct sizes and fabrication methods.
6. All required transitions and noted whether they are flat on top, flat on bottom, or
concentric.
7. All field seams required and the proper method of joint shall be indicated.
8. All sections to be internally lined shall be indicated, and the increased
dimensions shall be noted.
9. All sections that are to be installed with flexible ductwork shall be indicated.
10. Volume dampers, motorized dampers, turning vanes, and extractor installation,
fabrication and locations.
11. Hanging and supporting details.
12. Drawings shall show ductwork elevations in relation to ceiling height with
clearance worked out between ductwork, piping, electrical fixtures, and
structure.
1.05 RECORD DRAWINGS:
A. Submit Record Drawings in accordance with Division 1 requirements.
1.06 DELIVERY, STORAGE AND HANDLING:
A. Protect shop fabricated and factory fabricated ductwork, accessories and purchased
products from damage during shipment, storage, and handling. Prevent end damage and
prevent dirt and moisture from entering ducts and fittings.
B. Where possible, store ductwork inside and protect from the weather. Where necessary to
store outside, store above grade and enclosed with waterproof wrapping.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 3
PART 2 � PRODUCTS
2.01 MANUFACTURERS:
A. Subject to compliance with requirements, provide products of one of the following:
1. Metal duct:
a. U.S. Steel
b. Republic Steel
c. Wheeling Steel
d. Norfolk
2. Metal duct accessories:
a. Ductmate Industries, Inc.
3. Factory Fabricated Round or Oval Ductwork
a. C & R (Pinnacle)
b. Dixie Sheetmetal
c. Eastern Sheetmetal
d. JTD Spiral(Indiana Supply)
e. Lapine Metal Products
f. SPIROsafe; Div of Lindab
g. Semco (L.J. Fiesel)
h. Tangent Air (Doug Studebaker?)
i. U. S. Air Duct
j. United Sheetmetal Div. United McGill Corp.
4. Duct Liner
a. Certainteed “ToughGard”
b. Knauf E�M
c. Johns Manville Linacoustic RC
5. Duct sealant:
a. Polymer Adhesives
b. Ductmate
c. Fosters
d. United Duct Sealant
e. Hardcast
6. Dual wall ductwork and fittings:
a. McGill AirFlow LLC.
b. Sheet Metal Connectors, Inc.
2.02 DUCTWORK:
A. General: Where ductwork is indicated to be exposed to view in occupied spaces, provide
materials which are free from visual defects and imperfections including fittings, seam
markings, roller marks, stains and discolorations, and other imperfections, including
those which would impair painting.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 4
B. Sheet Metal: Except as otherwise indicated, fabricate ductwork from galvanized sheet
metal steel complying with ANSI/ASTM A 653, lockforming quality and ANSI/ASTM
A 653M, G90 zinc coating; mill phosphatized for exposed locations.
C. Painted Sheet Metal: Where architectural or mechanical drawings, schedules, details or
specifications call for ductwork to be finish painted in exposed locations, galvanized
sheet metal shall be pre�etched type known as "galvaneal" or "paint�grip." Clarify with
Engineer before fabrication.
D. Stainless Steel Sheet: Where indicated, provide stainless steel complying with
ANSI/ASTM A 480; AISI Type 304, with No. 4 directional polish where exposed to
view in occupied spaces. Protect finished surfaces with mill�applied adhesive protective
paper, maintained through fabrication and installation. Where concealed, provide mill
finish on sheets.
E. Aluminum Sheet: Where indicated, provide aluminum complying with ANSI/ASTM
B209, Alloy 3003, Temper H14.
F. Rectangular Ductwork:
1. Ductwork shall be fabricated of gages and reinforcement complying with
SMACNA Standards, and shall be of sizes as shown on Drawings. Dimensions
as shown are inside measurements indicating free area required.
2. Ducts noted to receive liner shall be increased in size to maintain the inside
dimensions noted.
G. Round Ductwork:
1. Round ducts shall be factory fabricated zinc coated steel of spiral lockseam
construction.
2. Round duct fittings shall be factory fabricated zinc coated steel for 45 or conical
take�off from the main trunk.
H. Dual Wall Round and Flat Oval Ductwork:
1. Where indicated on the drawings, double wall, acoustically insulated round
and/or flat oval ducts shall be supplied.
a. Double wall duct shall be constructed of an outer shell, a 1" thick layer
of fiberglass insulation, and an inner metal liner.
b. Insulation shall have a thermal conductivity "K" factor of 0.26 BTU
in/hr/sq. ft. /˚F or less.
c. Install spacers that position the inner duct at uniform distance from outer
duct without compressing insulation.
d. The inner metal liner for all spiral and longitudinal seam duct shall be
perforated metal.
e. Coat insulation with antimicrobial coating.
f. In ducts with perforated metal liner, cover insulation with polyester film
complying with UL 181, Class 1.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 5
g. All fittings from fan discharge to a point where 35 lineal feet of spiral
duct has been used shall have a perforated metal liner.
h. All other fittings shall have a solid metal liner, which may be one even
gauge lighter than that shown for perforated liners.
I. Dual Wall Rectangular Ductwork and Fittings:
1. Rectangular Ducts: Fabricate ducts with indicated dimensions for the inner duct.
2. Outer Duct: Comply with SMACNA's "HVAC Duct Construction Standards �
Metal and Flexible" based on indicated static�pressure class unless otherwise
indicated.
3. Transverse Joints: Select joint types and fabricate according to SMACNA's
"HVAC Duct Construction Standards � Metal and Flexible," Figure 2�1,
"Rectangular Duct/Transverse Joints," for static�pressure class, applicable
sealing requirements, materials involved, duct�support intervals, and other
provisions in SMACNA's "HVAC Duct Construction Standards � Metal and
Flexible."
4. Longitudinal Seams: Select seam types and fabricate according to SMACNA's
"HVAC Duct Construction Standards � Metal and Flexible," Figure 2�2,
"Rectangular Duct/Longitudinal Seams," for static�pressure class, applicable
sealing requirements, materials involved, duct�support intervals, and other
provisions in SMACNA's "HVAC Duct Construction Standards � Metal and
Flexible."
5. Interstitial Insulation:
a. Insulation shall have a thermal conductivity "K" factor of 0.26 BTU
in/hr/sq. ft. /˚F or less.
b. Install spacers that position the inner duct at uniform distance from outer
duct without compressing insulation.
c. Coat insulation with antimicrobial coating.
d. Cover insulation with polyester film complying with UL 181, Class 1.
6. Inner Duct: Minimum 0.028�inch [perforated galvanized sheet steel having 3/32�
inch diameter perforations, with overall open area of 23 percent] [solid sheet
steel].
7. Formed�on Transverse Joints (Flanges): Select joint types and fabricate
according to SMACNA's "HVAC Duct Construction Standards � Metal and
Flexible," Figure 2�1, "Rectangular Duct/Traverse Joints," for static�pressure
class, applicable sealing requirements, materials involved, duct�support intervals,
and other provisions in SMACNA's "HVAC Duct Construction Standards �
Metal and Flexible."
8. Longitudinal Seams: Select seam types and fabricate according to SMACNA's
"HVAC Duct Construction Standards � Metal and Flexible," Figure 2�2,
"Rectangular Duct/Longitudinal Seams," for static�pressure class, applicable
sealing requirements, materials involved, duct�support intervals, and other
provisions in SMACNA's "HVAC Duct Construction Standards � Metal and
Flexible."
J. Kitchen Exhaust Ductwork
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 6
1. Kitchen exhaust ductwork shall be sized to have a minimum velocity of 1500
FPM with the same net area from the duct collar to the exhaust fan.
2. It shall be constructed of 16 gauge metal of either black iron steel, properly
primed and painted with suitable high temperature paint, or galvanized steel with
welded seams which are primed and painted.
3. Ductwork shall be welded, liquid tight (continuous external welds) to comply
with NFPA 96.
4. Furnish airtight cleanouts as required by code, as indicated on the drawings, and
at each change in direction.
5. Ductwork shall be sloped to pitch a minimum of ¼” per lineal foot.
K. Listed Grease Ducts
1. Manufacturers: Subject to compliance with requirements, provide products by
one of the following:
a. CaptiveAire
b. Heat�Fab, Inc.
c. Metal�Fab, Inc.
d. Schebler Co. (The).
e. Selkirk Inc.; Selkirk Metalbestos and Air Mate.
f. Van�Packer Company, Inc.
2. Description: Double�wall metal vents tested according to UL 1978 and rated for
500 deg F continuously, or 2000 deg F for 30 minutes; with positive or negative
duct pressure and complying with NFPA 211.
3. Construction: Inner shell and outer jacket separated by at least a 4�inch annular
space filled with high�temperature, ceramic�fiber insulation.
4. Inner Shell: ASTM A 666, type 316 stainless steel.
5. Outer Jacket: Stainless steel where concealed. Stainless steel where exposed.
6. Accessories: Tees, elbows, increasers, hood connectors, terminations, adjustable
roof flashings, storm collars, support assemblies, thimbles, firestop spacers, and
fasteners; fabricated from similar materials and designs as vent�pipe straight
sections; all listed for same assembly. Include unique components required to
comply with NFPA 96 including cleanouts, transitions, adapters and drain
fittings.
L. Dishwasher Exhaust Ductwork
1. Dishwasher exhaust ductwork shall be 16 gauge, type 304 stainless steel, liquid�
tight, continuous welded construction.
M. Shop Fabricated Ductwork:
1. Shop fabricate ductwork in 4, 8, 10 or 12 � foot lengths, unless otherwise
indicated or required to complete runs. Fabricated to pressure standards per
SMACNA guidelines. Pre�assemble work in shop to greatest extent possible, so
as to minimize field assembly of systems. Disassemble systems only to extent
necessary for shipping and handling. Match�mark sections for reassembly and
coordinated installation.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 7
2. Shop fabricate ductwork of gages and reinforcement complying with SMACNA
standards.
3. Fabricate duct fittings to match adjoining ducts, and to comply with duct
requirements as applicable to fittings.
a. Except as otherwise indicated, fabricate elbows with centerline radius
equal to 1.5 times the duct width in the plane of the turn; and fabricate to
include factory manufactured turning vanes in elbows where shorter
radius is necessary.
b. Limit angular tapers to 30 degrees for contracting tapers and 20 degrees
for expanding tapers.
4. General: Longitudinal joints shall be shop or field sealed Pittsburgh or Snap�
Lock Joints. Snap�lock joints are permitted in all ductwork of 144 square inch or
less. Use Pittsburgh joints only on all ducts larger than 144 square inches.
5. Transverse joints shall be per SMACNA standards for pressure class. Seal in
field after erection.
6. Fittings:
a. Round and flat oval duct fittings shall be factory fabricated zinc coated
steel for 45 or conical take�off from the main trunk.
b. Do not use bull head fittings.
7. Duct Configuration:
a. Ducts in chases shall have concentric offsets.
b. Ducts above ceilings (horizontal) shall have eccentric offsets to provide
maximum clearances.
2.03 METAL GAUGES SINGLE WALL ROUND AND FLAT OVAL DUCTWORK:
ROUND DUCTS WITH MAXIMUM 2" W.G. POSITIVE STATIC PRESSURE
Duct Diameter
Spiral Duct
Fittings and
Longitudinal Seam Duct
3" thru 26" 26 24
28" thru 36" 24 22
ROUND DUCTS FOR POSITIVE PRESSURE UP TO +4” W.G.:
Duct Diameter
Spiral Duct
Fittings and
Longitudinal Seam Duct
3” thru 16” 26 24
17” thru 18” 24 24
19” thru 22” 24 22
24” thru 26” 24 22
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 8
ROUND DUCTS WITH MAXIMUM �2" W.G. NEGATIVE STATIC PRESSURE
Duct Diameter
Spiral Duct
Fittings and
Longitudinal Seam Duct
3" thru 17" 26 24
18" thru 20" 24 22
21" thru 22" 24 20
24" thru 26" 22 20
28" thru 30" 22 18
Notes:
1. Reinforce with 1" x 1" x 1/8" girth rings every 6 ft.
2. Reinforce with 1¼" x 1¼" x 3/16" girth rings every 4 ft.
3. When companion flange joints are used as reinforcement,
44" to 48" diameter shall be 2" x 2" x 3/16"
50" to 60" diameter shall be 2½ x 2½ x 3/16"
2.04 METAL GAUGES DUAL WALL ROUND AND FLAT OVAL DUCTWORK:
DUAL WALL ROUND DUCTS WITH MAXIMUM 2" W.G. POSITIVE STATIC PRESSURE
Spiral Duct Fittings and Longitudinal Seam Duct
Inside Diameter Shell Perforated Liner Shell Perforated Liner
3" thru 8" 26 26 (non�ribbed) 24 24
9" thru 24" 26 26 (ribbed) 24 24
26" thru 34" 24 26 (ribbed) 22 24
36" thru 48" 22 26 (ribbed) 20 22
50" thru 58" 20 26 (ribbed) 18 22
60" thru 62" 18 26 (ribbed) 16 22
64" thru 76" 18 22 (non�ribbed) 16 22
DUAL WALL ROUND DUCTS FOR POSITIVE STATIC PRESSURE UP TO +4” W.G.:
Spiral Duct Fittings and Longitudinal Seam Duct
Inside Diameter Shell Perforated Liner Shell Perforated Liner
3” thru 8” 26 26 (non�ribbed) 24 24
9” thru 14” 26 26 (ribbed) 24 24
15” thru 16” 24 26 (ribbed) 24 24
17” thru 20” 24 26 (ribbed) 22 24
22” thru 24” 24 26 (ribbed) 22 24
26” thru 34” 22 26 (ribbed) 20 24
36” thru 48” 20 26 (ribbed) 20 22
50” thru 58” 18 26 (ribbed) 18 22
60” thru 76” 18 22 (non�ribbed) 16 22
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 9
DUAL WALL ROUND DUCTS WITH MAXIMUM �2” W.G. NEGATIVE STATIC
PRESSURE:
Spiral Duct Fittings and Longitudinal Seam Duct
Inside Diameter Shell Perforated Liner Shell Perforated Liner
3” thru 8” 26 26 (non�ribbed) 24 24
9” thru 15” 26 26 (ribbed) 24 24
16” thru 20” 24 26 (ribbed) 22 24
22” thru 24” 22 26 (ribbed) 20 24
26” thru 28” 22 26 (ribbed) 18 24
30” thru 32” 20 26 (ribbed) 18 24
34” thru 40” 20 26 (ribbed) 16 22
42” thru 46” 20 22 (non�ribbed) 18 (Notes 1 & 3) 22
48” thru 58” 18 26 (non�ribbed) 18 (Notes 1 & 3) 22
Notes:
1. Reinforce with 1" x 1" x 1/8" girth rings every 6 ft.
2. Reinforce with 1¼" x 1¼" x 3/16" girth rings every 4 ft.
3. When companion flange joints are used as reinforcement,
44" to 48" diameter shall be 2" x 2" x 3/16"
50" to 60" diameter shall be 2½ x 2½ x 3/16"
2.05 MISCELLANEOUS DUCTWORK MATERIALS:
A. General: Provide miscellaneous materials and products of types and sizes indicated and,
where not otherwise indicated, provide type and size required to comply with ductwork
system requirements including proper connection of ductwork and equipment. All
adhesives and sealants shall be water based. Contractor may use solvent based sealants
for specific cases when requested in writing and approved by the Engineer.
B. Duct Liner Adhesive: Comply with American Society for Testing and Materials
(ASTM) ASTM 916 "Specifications for Adhesives for Duct Thermal Insulation." Duct
liner shall be adhered to the sheet metal and, where required, edges coated with one of
the adhesives conforming to the Standard for Adhesives for Duct Liner,
ASC�A�7001C�1972, of the Adhesive and Sealant Council, Inc.
C. Duct liner shall be further secured with fasteners conforming to the Mechanical Fastener
Standard, MF�1�1975, on page 22 of the Duct Liner Application Standard, second
edition, of the Sheet Metal and Air Conditioning Contractor's National Association.
D. Duct Sealant: Water based non�hardening, non�migrating mastic or liquid elastic sealant
(type applicable for fabrication/installation detail) as compounded and recommended by
manufacturer specifically for sealing joints and seams in ductwork.
E. Duct Cement: Water based non�hardening non�migrating mastic or liquid neoprene
based cement (type applicable for fabrication/installation detail) as compounded and
recommended by manufacturer specifically for cementing fitting components, or
longitudinal seams in ductwork.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 10
F. Ductwork Support Materials: Except as otherwise indicated, provide hot�dipped
galvanized steel fasteners, anchors, rods, straps, trim and angles for support of ductwork.
G. For exposed stainless steel ductwork, provide matching stainless steel support materials.
H. For aluminum ductwork, provide aluminum support materials except where materials are
electrolytically separated from ductwork.
2.06 INTERNAL DUCT LINER:
A. Duct�Liner: Fibrous glass, complying with American Society for Testing Materials
(ASTM) ASTM C 1071 Type I; of thickness indicated.
1. Liner shall be 1" thick, or as otherwise noted, composed of long textile type
glass fibers firmly bonded in random orientation with a thermosetting phenolic
resin.
2. Liner shall have a minimum density of 1.5 lb/cu. ft, thermal conductivity of 0.24
at 75˚ F mean temperature.
3. Liner shall have a minimum sound absorption co�efficient of 0.59 at 500 Hz
based upon ASTM Test Method C�423.
4. Liner shall be able to withstand velocities up to 6,000 feet per minute.
5. The air stream surface shall contain an EPA registered anti�microbial agent to
reduce the potential of microbial growth that might affect the liner.
6. Liner shall have a Flame Spread Index of 25 and Maximum Smoke Developed
Index of 50.
B. Unless otherwise indicated, the net free area of the duct dimensions given on the
Drawings shall be maintained. Increase metal duct dimensions as necessary to
compensate for addition of the liner.
C. The interior duct insulation shall be applied as recommended by the manufacturer
including proper adhesive and adhered clips. Clip spacing shall not exceed 8" on center
perpendicular to air flow and shall not exceed 12" on center in the direction of air flow.
D. All joints of the insulation shall have edges buttered with sealant, and shall be tightly
butted. Apply a brush coat of sealant at all joints on the surface of the duct liner
extending at least 1" on each side of joint.
E. Provide metal nosing on all exposed edges of duct liner at fire dampers, control dampers,
fan discharges, etc.
F. Liner may be adhered to the sheet metal before it is formed into ducts provided care is
taken not to damage the insulation.
G. The following ductwork shall be externally insulated and is work of another section:
1. Fresh air ducts and plenums
2. Relief air duct between the relief or motorized shut�off damper and the outside
louver, including the relief plenum
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 11
3. See Specification Section 20 02 50 for examples of other ductwork that does not
require liner.
2.07 SEALANT AND GASKETS:
A. General Sealant and Gasket Requirements: Surface�burning characteristics for sealants
and gaskets shall be a maximum flame�spread index of 25 and a maximum smoke�
developed index of 50 when tested according to UL 723; certified by an NRTL.
B. Two�Part Tape Sealing System:
1. Tape: Woven cotton fiber impregnated with mineral gypsum and modified
acrylic/silicone activator to react exothermically with tape to form hard, durable,
airtight seal.
2. Tape Width: 3 inches, 4 inches, or 6 inches.
3. Sealant: Modified styrene acrylic.
4. Water resistant.
5. Mold and mildew resistant.
6. Maximum Static�Pressure Class: 10�inch wg, positive and negative.
7. Service: Indoor and outdoor.
8. Service Temperature: Minus 40 to plus 200 deg F.
9. Substrate: Compatible with galvanized sheet steel both PVC coated and bare,
stainless steel, or aluminum.
10. For indoor applications, sealant shall have a VOC content of 250 g/L or less
when calculated according to 40 CFR 59, Subpart D (EPA Method 24).
11. Sealant shall comply with the testing and product requirements of the California
Department of Health Services' "Standard Practice for the Testing of Volatile
Organic Emissions from Various Sources Using Small�Scale Environmental
Chambers."
C. Water�Based Joint and Seam Sealant:
1. Application Method: Brush on.
2. Solids Content: Minimum 65 percent.
3. Shore A Hardness: Minimum 20.
4. Water resistant.
5. Mold and mildew resistant.
6. VOC: Maximum 75 g/L (less water).
7. Maximum Static�Pressure Class: 10�inch wg, positive and negative.
8. Service: Indoor or outdoor.
9. Substrate: Compatible with galvanized sheet steel (both PVC coated and bare),
stainless steel, or aluminum sheets.
D. Solvent�Based Joint and Seam Sealant:
1. Application Method: Brush on.
2. Base: Synthetic rubber resin.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 12
3. Solvent: Toluene and heptane.
4. Solids Content: Minimum 60 percent.
5. Shore A Hardness: Minimum 60.
6. Water resistant.
7. Mold and mildew resistant.
8. For indoor applications, sealant shall have a VOC content of 250 g/L or less
when calculated according to 40 CFR 59, Subpart D (EPA Method 24).
9. VOC: Maximum 395 g/L.
10. Sealant shall comply with the testing and product requirements of the California
Department of Health Services' "Standard Practice for the Testing of Volatile
Organic Emissions from Various Sources Using Small�Scale Environmental
Chambers."
11. Maximum Static�Pressure Class: 10�inch wg, positive or negative.
12. Service: Indoor or outdoor.
13. Substrate: Compatible with galvanized sheet steel both PVC coated and bare,
stainless steel, or aluminum sheets.
E. Flanged Joint Sealant: Comply with ASTM C 920.
1. General: Single�component, acid�curing, silicone, elastomeric.
2. Type: S.
3. Grade: NS.
4. Class: 25.
5. Use: O.
6. For indoor applications, sealant shall have a VOC content of 250 g/L or less
when calculated according to 40 CFR 59, Subpart D (EPA Method 24).
7. Sealant shall comply with the testing and product requirements of the California
Department of Health Services' "Standard Practice for the Testing of Volatile
Organic Emissions from Various Sources Using Small�Scale Environmental
Chambers."
F. Flange Gaskets: Butyl rubber, neoprene, or EPDM polymer with polyisobutylene
plasticizer.
G. Round Duct Joint O�Ring Seals:
1. Seal shall provide maximum leakage class of3 cfm/100 sq. ft. at 1�inch wg and
shall be rated for10�inch wg static�pressure class, positive or negative.
2. EPDM O�ring to seal in concave bead in coupling or fitting spigot.
3. Double�lipped, EPDM O�ring seal, mechanically fastened to factory�fabricated
couplings and fitting spigots.
2.08 HANGERS AND SUPPORTS:
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 13
A. Indicate the extent of corrosive environment on Drawings.
B. Hanger Rods for Noncorrosive Environments: Cadmium�plated steel rods and nuts.
C. Hanger Rods for Corrosive Environments: Electrogalvanized, all�thread rods or
galvanized rods with threads painted with zinc�chromate primer after installation.
D. Strap and Rod Sizes: Comply with SMACNA's "HVAC Duct Construction Standards �
Metal and Flexible," Table 5�1, "Rectangular Duct Hangers Minimum Size," and
Table 5�2, "Minimum Hanger Sizes for Round Duct."
E. Steel Cables for Galvanized�Steel Ducts: Galvanized steel complying with
ASTM A 603.
F. Steel Cables for Stainless�Steel Ducts: Stainless steel complying with ASTM A 492.
G. Steel Cable End Connections: Cadmium�plated steel assemblies with brackets, swivel,
and bolts designed for duct hanger service; with an automatic�locking and clamping
device.
H. Duct Attachments: Sheet metal screws, blind rivets, or self�tapping metal screws;
compatible with duct materials.
I. Trapeze and Riser Supports:
1. Supports for Galvanized�Steel Ducts: Galvanized�steel shapes and plates.
2. Supports for Stainless�Steel Ducts: Stainless�steel shapes and plates.
3. Supports for Aluminum Ducts: Aluminum or galvanized steel coated with zinc
chromate.
PART 3 � EXECUTION
3.01 GENERAL:
A. Assemble and install ductwork in accordance with recognized industry practices which
will achieve air tight (max. 5 % leakage) and noiseless (no objectionable noise) systems,
capable of performing each indicated service. Install each run with minimum of joints.
B. Align ductwork accurately at connections, within 1/8" misalignment tolerance and with
internal surfaces smooth.
C. Support ducts rigidly with suitable ties, braces, hangers and anchors of type which will
hold duct true�to shape and to prevent buckling.
D. Provide all necessary offsets and transformations as required in the installation of the
work although same may not be specifically shown on the plans. Offset all ducts as
required to increase head room under them, to improve the appearance of exposed ducts,
and to avoid interference with the work of other trades.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 14
E. Locate ductwork runs, except as otherwise indicated, vertically and horizontally and
avoid diagonal runs wherever possible.
F. Locate runs as indicated by diagrams, details and notations or, if not otherwise indicated,
run ductwork in shortest route which does not obstruct usable space or block access for
servicing building and its equipment.
G. Hold ducts close to walls overhead construction, columns, and other structural and
permanent enclosure elements of building. Limit clearance to 1/2" where furring is
shown for enclosure or concealment of ducts, but allow for insulation thickness, if any.
H. Where possible, in finished and occupied spaces, conceal ductwork from view, by
locating in mechanical shafts, furring, or above suspended ceilings. Do not encase
horizontal runs in solid partitions, except as specifically shown. Coordinate the layout
with suspended ceiling and lighting layouts and similar finished work.
I. Where ducts pass through interior partitions and exterior walls, conceal space between
construction opening and duct or duct�plus�insulation with sheet metal flanges of same
gage as duct. Overlap opening on four sides by at least 1�1/2".
J. Where ducts pass through time�rated fire resistive construction, all openings around the
ducts shall be sealed with fire stopping material as specified in Division 07, except
where fire dampers are shown, noted or required.
K. Provide angle, channel, or equal type frames for all manual and automatic dampers and
install as required.
L. In toilet exhaust systems serving two or more floors, install featherweight backdraft
damper in the branch ductwork to each floor.
M. Provide drain pans at built up air handling systems. Provide multiple drain pans at
multiple cooling coil sections.
N. Coordinate duct installations with installation of accessories, dampers, coil frames,
equipment, controls and other associated work of ductwork system.
O. Support ductwork in manner complying with SMACNA "HVAC Duct Construction
Standards" hanger and supports Section.
3.02 GENERAL REQUIREMENTS – HIGH PRESSURE DUCTS
A. Except as otherwise noted, all main and branch trunk ducts shall be round or flat oval
spiral constructed ductwork.
B. Connections between main and branch trunk ducts and high pressure mixing boxes shall
be high pressure flexible duct as specified in Section 23 33 46 “FLEXIBLE
DUCTWORK”.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 15
C. Flat oval ducts shall be reinforced by using "C" braces in the following sizes and
spacing. Where oval ducts have flanged joints, the joints count as reinforcing.
Additional reinforcing shall be measured from the flanges.
Flat Span Dimension (In.) "C" Brace Size Spacing
Below 20" None required
through 27" 1" x 1" x 1/8" 6'�0" O.C.
through 39" 1�1/2" x 1�1/2" x 3/16" 6'�0" O.C.
through 51" 2" x 2" x 3/16" 4'�0" O.C.
through 55" 2" x 2" x 3/16" 3'�0" O.C.
and larger 2" x 2" x 3/16" 2'�0" O.C.
D. Radius type elbows fabricated with inside radius equal to width of duct; square throat
elbows with turning vanes will be permitted only where shown on Drawings or by
written approval of Architect/Engineer for specific cause.
E. Wherever sound attenuators are installed in ducts, duct area shall be increased in size and
be connected with manufacturer’s recommended transitions to maintain velocity.
F. All ducts designated as high pressure shall be sealed to meet SMACNA Class A
classification. Both longitudinal and transverse joints and duct wall penetrations are to
be sealed.
3.03 INSTALLATION OF RECTANGULAR DUCTWORK:
A. Field changes in duct dimensions shall result in equivalent cross�sectional areas to
dimensions shown. In no case shall the greater dimension be greater than four times the
lesser.
B. All transitions shall be made with long transition fittings. Ducts shall be flared to suit
shape of registers and grilles or openings for registers and grilles. Maximum angle of
transition of 20 for diverging air flow and 30 for contracting air flow.
C. Provide engineered air foil blades turning vanes at square elbows, minimum 2 1�1/2"
wide, where shown on the drawings, and where changes in direction cannot be made as
specified above. Turning vanes shall be installed inside the insulation on internally lined
ducts.
D. All rectangular sheet metal ducts over 18" in width shall be cross broken or mechanically
beaded to reduce vibration. Reinforcing angle and stiffeners shall be provided where
required to prevent sagging, buckling, vibration, sound transmission, etc.
E. Changes in direction shall be made with easy flowing curves. The minimum center line
radius of bends shall be at least 1�1/2 times the dimension of the duct in the plane of the
turn unless otherwise shown. Radius type elbows fabricated with the inside radius equal
to width of duct; short radius elbows will be permitted only by written approval of
Architect/Engineer for specific cause.
F. Ducts shall be fabricated to a minimum of SMACNA 2" pressure classification.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 16
G. All ducts shall be sealed to meet SMACNA Class B classification. Both longitudinal and
transverse joints are to be sealed.
3.04 INSTALLATION OF ROUND AND FLAT OVAL DUCTWORK:
A. Ducts shall be assembled so that they are free of obstructions, smooth on the inside and
airtight.
B. All high pressure duct shall be installed in accordance with the latest instructions of the
duct manufacturer.
C. All flat oval ductwork shall be reinforced and braced in accordance with the published
details of the flat oval duct manufacturer for the applicable size and pressure conditions.
D. All branch takeoffs from trunk ducts shall be made with a cone shaped adapter to the
trunk duct. The adapter shall be 2" more in dimension than the branch and shall taper to
branch duct size with the side of the adapter not exceeding 15 degrees from the
horizontal.
E. In low pressure ductwork, spin�in fittings may be used for round branch take�offs from
rectangular duct.
F. Dissimilar metals shall have a heavy coat of zinc primer applied at connection point to
keep surfaces from direct contact with each other.
3.05 HIGH PRESSURE DUCT JOINTS AND CONNECTIONS:
A. Joints shall be slip joints for all round and flat oval ducts having the major axis less than
40". Flat oval ducts with major axis 40" and larger shall have flanged joints.
B. All joints shall be sealed to meet SMACNA Class A classification using duct
manufacturer's sealant and tape and in strict accordance with the duct manufacturer's
written instructions.
3.06 PAINTING:
A. Paint interior of metal ducts that are visible through registers and grilles and that do not
have duct liner. Apply one coat of flat, black, latex paint over a compatible galvanized�
steel primer.
3.07 FIRE DAMPERS, SMOKE DAMPERS, AND COMBINATION FIRE�SMOKE DAMPERS:
A. Fire dampers and combination fire�smoke dampers shall be installed in all ducts passing
through time rated fire resistive construction including but not limited to walls, floors,
and shafts, whether shown or not, and elsewhere as shown on the Drawings and as
required by the Building Code. All installations shall be in strict accordance with NFPA
90A and 101 and manufacturer’s recommendations for compliance with their ratings.
B. Access sections, panels and/or doors shall be installed adjacent to each fire damper,
smoke damper or combination fire�smoke damper. Access openings shall be labeled.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 17
3.08 LINTELS:
A. Mechanical Contractor shall be responsible for furnishing and installing lintels over all
ducts that pass through load bearing walls and any duct over 12" wide. Lintel size shall
be sufficient to support loads above. Lintel material shall be as approved by the
Architect/Engineer. Lintels shall be installed by craftsmen skilled in this particular
trade.
3.09 INSTALLATION OF GREASE DUCTS:
A. Locate to comply with minimum clearances from combustibles and minimum
termination heights according to product listing or NFPA 211, whichever is most
stringent.
B. Seal between sections of positive�pressure vents and grease exhaust ducts according to
manufacturer's written installation instructions, using sealants recommended by
manufacturer.
C. Support vents at intervals recommended by manufacturer to support weight of vents and
all accessories, without exceeding appliance loading.
D. Lap joints in direction of flow.
3.10 FIELD QUALITY CONTROL
A. Perform tests and inspections.
B. Leakage Tests:
1. Comply with SMACNA's "HVAC Air Duct Leakage Test Manual." Submit a
test report for each test.
2. Test the following systems:
a. Ducts with a Pressure Class Higher Than 3�Inch wg: Test representative
duct sections totaling no less than 25 percent of total installed duct area
for each designated pressure class.
b. Supply Ducts with a Pressure Class of 2�Inch wg or Higher: Test
representative duct totaling no less than 50 percent of total installed duct
area for each designated pressure class.
c. Return Ducts with a Pressure Class of 2�Inch wg or Higher: Test
representative duct sections totaling no less than 50 percent of total
installed duct area for each designated pressure class.
d. Exhaust Ducts with a Pressure Class of 2�Inch wg or Higher: Test
representative duct sections totaling no less than 50 percent of total
installed duct area for each designated pressure class.
e. Outdoor Air Ducts with a Pressure Class of 2�Inch wg or Higher: Test
representative duct totaling no less than 50 percent of total installed duct
area for each designated pressure class.
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 18
3. Disassemble, reassemble, and seal segments of systems to accommodate leakage
testing and for compliance with test requirements.
4. Test for leaks before applying external insulation.
5. Conduct tests at static pressures equal to maximum design pressure of system or
section being tested. If static�pressure classes are not indicated, test system at
maximum system design pressure. Do not pressurize systems above maximum
design operating pressure.
6. Give seven (7) days' advance notice for testing.
C. Duct System Cleanliness Tests:
1. Visually inspect duct system to ensure that no visible contaminants are present.
2. Test sections of metal duct system, chosen randomly by Owner, for cleanliness
according to "Vacuum Test" in NADCA ACR, "Assessment, Cleaning and
Restoration of HVAC Systems."
a. Acceptable Cleanliness Level: Net weight of debris collected on the
filter media shall not exceed 0.75 mg/100 sq. cm.
D. Duct system will be considered defective if it does not pass tests and inspections.
E. Prepare test and inspection reports.
3.11 DUCT CLEANING
A. Clean new duct system(s) before testing, adjusting, and balancing.
B. Use service openings for entry and inspection.
1. Create new openings and install access panels appropriate for duct static�
pressure class if required for cleaning access. Provide insulated panels for
insulated or lined duct. Patch insulation and liner as recommended by duct liner
manufacturer. Comply with Section 23 33 00 "Air Duct Accessories" for access
panels and doors.
2. Disconnect and reconnect flexible ducts as needed for cleaning and inspection.
3. Remove and reinstall ceiling to gain access during the cleaning process.
C. Particulate Collection and Odor Control:
1. When venting vacuuming system inside the building, use HEPA filtration with
99.97 percent collection efficiency for 0.3�micron�size (or larger) particles.
2. When venting vacuuming system to outdoors, use filter to collect debris removed
from HVAC system, and locate exhaust downwind and away from air intakes
and other points of entry into building.
D. Clean the following components by removing surface contaminants and deposits:
1. Air outlets and inlets (registers, grilles, and diffusers).
L’Acquis Number: 12056
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Matt the Miller's Tavern
Carmel, Indiana
Project No. 12056 DUCTWORK 23 31 13 � 19
2. Supply, return, and exhaust fans including fan housings, plenums (except ceiling
supply and return plenums), scrolls, blades or vanes, shafts, baffles, dampers,
and drive assemblies.
3. Air�handling unit internal surfaces and components including mixing box, coil
section, air wash systems, spray eliminators, condensate drain pans, humidifiers
and dehumidifiers, filters and filter sections, and condensate collectors and
drains.
4. Coils and related components.
5. Return�air ducts, dampers, actuators, and turning vanes except in ceiling plenums
and mechanical equipment rooms.
6. Supply�air ducts, dampers, actuators, and turning vanes.
7. Dedicated exhaust and ventilation components and makeup air systems.
E. Mechanical Cleaning Methodology:
1. Clean metal duct systems using mechanical cleaning methods that extract
contaminants from within duct systems and remove contaminants from building.
2. Use vacuum�collection devices that are operated continuously during cleaning.
Connect vacuum device to downstream end of duct sections so areas being
cleaned are under negative pressure.
3. Use mechanical agitation to dislodge debris adhered to interior duct surfaces
without damaging integrity of metal ducts, duct liner, or duct accessories.
4. Clean fibrous�glass duct liner with HEPA vacuuming equipment; do not permit
duct liner to get wet. Replace fibrous�glass duct liner that is damaged,
deteriorated, or delaminated or that has friable material, mold, or fungus growth.
5. Clean coils and coil drain pans according to NADCA 1992. Keep drain pan
operational. Rinse coils with clean water to remove latent residues and cleaning
materials; comb and straighten fins.
6. Provide drainage and cleanup for wash�down procedures.
7. Antimicrobial Agents and Coatings: Apply EPA�registered antimicrobial agents
if fungus is present. Apply antimicrobial agents according to manufacturer's
written instructions after removal of surface deposits and debris.
END OF SECTION