HomeMy WebLinkAboutH004 - HVAC SpecificationsSECTION 233113 - METAL DUCTS (cont)
3.3 HANGER AND SUPPORT INSTALLATION
A. Comply with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible," Chapter 5, "Hangers and Supports."
B. Building Attachments: Concrete inserts, powder-actuated fasteners, or structural-steel fasteners appropriate for construction materials to which hangers are being
attached.
1. Where practical, install concrete inserts before placing concrete.
2. Install powder-actuated concrete fasteners after concrete is placed and completely cured.
3. Use powder-actuated concrete fasteners for standard-weight aggregate concretes or for slabs more than 4 inches (100 mm) thick.
4. Do not use powder-actuated concrete fasteners for lightweight-aggregate concretes or for slabs less than 4 inches (100 mm) thick.
5. Do not use powder-actuated concrete fasteners for seismic restraints.
C. Hanger Spacing: Comply with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible," Table 5-1 (Table 5-1M), "Rectangular Duct Hangers Minimum
Size," and Table 5-2, "Minimum Hanger Sizes for Round Duct," for maximum hanger spacing; install hangers and supports within 24 inches (610 mm) of each elbow and
within 48 inches (1200 mm) of each branch intersection.
D. Hangers Exposed to View: Threaded rod and angle or channel supports.
E. Support vertical ducts with steel angles or channel secured to the sides of the duct with welds, bolts, sheet metal screws, or blind rivets; support at each floor and at a
maximum intervals of 16 feet (5 m).
F. Install upper attachments to structures. Select and size upper attachments with pull-out, tension, and shear capacities appropriate for supported loads and building
materials where used.
3.4 CONNECTIONS
A. Make connections to equipment with flexible connectors complying with Division 23 Section "Air Duct Accessories."
B. Comply with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible" for branch, outlet and inlet, and terminal unit connections.
3.7 START UP
A. Air Balance: Comply with requirements in Division 23 Section "Testing, Adjusting, and Balancing for HVAC."
3.8 DUCT SCHEDULE
A. Fabricate ducts with galvanized sheet steel:
B. Supply Ducts:
1. Ducts Connected to Constant-Air-Volume Air-Handling Units
a. Pressure Class: Positive 4-inch wg
b. Minimum SMACNA Seal Class: A.
c. SMACNA Leakage Class for Rectangular: 3.
d. SMACNA Leakage Class for Round and Flat Oval: 3.
B. Return Ducts:
1. Ducts Connected to Air-Handling Units
a. Pressure Class: Positive or negative 2-inch wg.
b. Minimum SMACNA Seal Class: A
c. SMACNA Leakage Class for Rectangular: 6.
d. SMACNA Leakage Class for Round and Flat Oval: 6.
C. Elbow Configuration:
1. Rectangular Duct: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure 4-2, "Rectangular Elbows."
a. Radius Type RE 1 with minimum 1.5 radius-to-diameter ratio.
b. Radius Type RE 3 with minimum 1.0 radius-to-diameter ratio and two vanes.
c. Mitered Type RE 2 with vanes complying with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible," Figure 4-3, "Vanes and Vane Runners,"
and Figure 4-4, "Vane Support in Elbows."
2. Rectangular Duct: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure 4-2, "Rectangular Elbows."
a. Radius Type RE 1 with minimum 1.5 radius-to-diameter ratio.
b. Radius Type RE 3 with minimum 1.0 radius-to-diameter ratio and two vanes.
c. Mitered Type RE 2 with vanes complying with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible," Figure 4-3, "Vanes and Vane Runners,"
and Figure 4-4, "Vane Support in Elbows."
3. Round Duct: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure 3-4, "Round Duct Elbows."
a. Minimum Radius-to-Diameter Ratio and Elbow Segments: Comply with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible," Table 3-1,
"Mitered Elbows." Elbows with less than 90-degree change of direction have proportionately fewer segments.
1) Radius-to Diameter Ratio: 1.5.
b. Round Elbows, 12 Inches (305 mm) and Smaller in Diameter: Stamped or pleated.
c. Round Elbows, 14 Inches (356 mm) and Larger in Diameter: Standing seam.
D. Branch Configuration:
1. Rectangular Duct: Comply with SMACNA's "HVAC Duct Construction Standards - Metal and Flexible," Figure 4-6, "Branch Connection."
a. Rectangular Main to Rectangular Branch: 45-degree entry.
b. Rectangular Main to Round Branch: Spin in.
2. Round and Flat Oval: Comply with SMACNA's "HVAC Duct Construction Standards -Metal and Flexible," Figure 3-5, "90 Degree Tees and Laterals," and Figure
3-6, "Conical Tees." Saddle taps are permitted in existing duct.
a. Velocity 1000 fpm (5 m/s) or Lower: 90-degree tap.
b. Velocity 1000 to 1500 fpm (5 to 7.6 m/s): Conical tap.
c. Velocity 1500 fpm (7.6 m/s) or Higher: 45-degree lateral.
END OF SECTION 233113
SECTION 233300 - AIR DUCT ACCESSORIES
PART 1 - GENERAL
1.1 SUBMITTALS
A. Product Data: For each type of product.
1.2 CLOSEOUT SUBMITTALS
A. Operation and Maintenance Data: For air duct accessories to include in operation and maintenance manuals.
PART 2 - PRODUCTS
2.1 MANUAL VOLUME DAMPERS
A. Standard Manual Volume Dampers:
1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:
a. Air Balance Inc.; a division of Mestek, Inc.
b. American Warming and Ventilating; a division of Mestek, Inc.
c. Flexmaster U.S.A., Inc.
d. Greenheck.
e. METALAIRE, Inc.
f. McGill AirFlow LLC.
g. Nailor Industries Inc.
h. Ruskin Company.
2. Standard leakage rating with linkage outside the airstream.
3. Suitable for horizontal or vertical applications.
4. Frames:
a. Frame: Hat-shaped, Minimum 0.052-inch-thick.
b. Mitered and welded corners.
c. Flanges for attaching to walls and flangeless frames for installing in ducts.
5. Blades:
a. Multiple or single blade.
b. Parallel- or opposed-blade design.
c. Stiffen damper blades for stability.
d. Minimum 0.064 inch (1.62 mm) thick.
6. Blade Axles: Galvanized or stainless to match duct construction.
7. Bearings:
a. Molded synthetic.
b. Dampers in ducts with pressure classes of 3-inch wg (750 Pa) or less shall have axles full length of damper blades and
bearings at both ends of operating shaft.
8. Tie Bars and Brackets: Galvanized steel.
9. Pressure classes of 3-inch w.g. or higher or for dampers larger than 14”x14”:
a. Muliple opposed blade design
b. Suitable for 2,000 FPM duct velocity
c. End bearings or other seals for ducts with axles running the full length of the damper blades.
d. Jackshaft to operate multiple section dampers from one side.
e. Provide a lacking hand quadrant with 2”stand-off mounting bracket.
10. Provide stainless or aluminum materials where dampers are shown in stainless or aluminum ductwork
2.9 FLEXIBLE DUCTS
A. Manufacturers: Subject to compliance with requirements, provide products by one of the following:
1. Flexmaster U.S.A., Inc.
2. McGill AirFlow LLC.
3. Ward Industries, Inc.; a division of Hart & Cooley, Inc.
B. Low Pressure, Insulated, Flexible Duct: UL 181, Class 1, 2-ply vinyl film supported by helically wound, spring-steel wire; fibrous-glass
insulation; polyethylene fire retardant vapor-barrier film.
1. Pressure Rating: 4-inch wg (1000 Pa) positive and 0.5-inch wg (125 Pa) negative.
2. Maximum Air Velocity: 4000 fpm (20 m/s).
3. Temperature Range: Minus 20 to plus 175 deg F (Minus 29 to plus 79 deg C).
4. Insulation R-value: Minimum R-6 or greater to comply with ASHRAE/IESNA 90.1.
C. Insulated, Flexible Duct: UL 181, Class 1, 2-ply vinyl film supported by helically wound, spring-steel wire; fibrous-glass insulation;
polyethylene fire retardant vapor-barrier film.
1. Pressure Rating: 10-inch wg (2500 Pa) positive and 1.0-inch wg (250 Pa) negative.
2. Maximum Air Velocity: 4000 fpm (20 m/s).
3. Temperature Range: Minus 20 to plus 175 deg F (Minus 29 to plus 79 deg C).
4. Insulation R-Value: Minimum R-6 or greater to comply with ASHRAE/IESNA 90.1.
SECTION 233300 -AIR DUCT ACCESSORIES (cont)
PART 3 - EXECUTION
3.1 INSTALLATION
A. Install duct accessories according to applicable details in SMACNA's "HVAC Duct Construction Standards -Metal and Flexible" for metal
ducts and in NAIMA AH116, "Fibrous Glass Duct Construction Standards," for fibrous-glass ducts.
B. Install duct accessories of materials suited to duct materials; use galvanized-steel accessories in galvanized-steel and fibrous-glass
ducts, stainless-steel accessories in stainless-steel ducts, and aluminum accessories in aluminum ducts.
C. Install volume dampers at points on supply, return, and exhaust systems where branches extend from larger ducts. Where dampers are
installed in ducts having duct liner, install dampers with hat channels of same depth as liner, and terminate liner with nosing at hat channel.
D. Set dampers to fully open position before testing, adjusting, and balancing.
E. Install test holes at fan inlets and outlets and elsewhere as indicated.
F. Connect flexible ducts to metal ducts with draw bands. Tape flex duct vapor barrier continuously with FSK tape.
G. Install flexible ducts with elbow radius’ no less than 1.5 times the duct diameter.
H. Support flexible ducts from structure, no from sprinkler pipe, conduits, or other above ceiling utilities, to prevent sagging and crimping.
I. Install duct test holes where required for testing and balancing purposes.
3.2 FIELD QUALITY CONTROL
A. Tests and Inspections:
1. Operate dampers to verify full range of movement.
2. Inspect locations of access doors and verify that purpose of access door can be performed.
3. Inspect turning vanes for proper and secure installation.
END OF SECTION 233300
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21019 IUH SPRINGMILLGI CLINIC RENOVATION: PHASE IApril 9, 2021
HVAC
Specifications
H00410300 N. ILLINOIS ST.INDIANAPOLIS, IN 46290# Revision Description
Date
Issued
06/08/21