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// CODE SNIPPET

M1601.1 Duct Design

2015 Michigan Residential Code > 16 Duct Systems > M1601 Duct Construction > M1601.1 Duct Design
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Duct systems serving heating, cooling and ventilation equipment shall be installed in accordance with the provisions of this section and ACCA Manual D, the appliance manufacturer's installation instructions or other approved methods.

M1601.1.1 Above-Ground Duct Systems

Above-ground duct systems shall conform to the following:
  1. Equipment connected to duct systems shall be designed to limit discharge air temperature to not greater than 250°F (121°C).
  2. Factory-made ducts shall be listed and labeled in accordance with UL 181 and installed in accordance with the manufacturer's instructions.
  3. Fibrous glass duct construction shall conform to the SMACNA Fibrous Glass Duct Construction Standards or NAIMA Fibrous Glass Duct Construction Standards.
  4. Field-fabricated and shop-fabricated metal and flexible duct constructions shall conform to the SMACNA HVAC Duct Construction Standards-Metal and Flexible except as allowed by Table M1601.1.1. Galvanized steel shall conform to ASTM A653.
  5. The use of gypsum products to construct return air ducts or plenums is permitted, provided that the air temperature does not exceed 125°F (52°C) and exposed surfaces are not subject to condensation.
  6. Duct systems shall be constructed of materials having a flame spread index of not greater than 200.
  7. Stud wall cavities and the spaces between solid floor joists to be used as air plenums shall comply with the following conditions:

    1. These cavities or spaces shall not be used as a plenum for supply air.
    2. These cavities or spaces shall not be part of a required fire-resistance-rated assembly.
    3. Stud wall cavities shall not convey air from more than one floor level.
    4. Stud wall cavities and joist-space plenums shall be isolated from adjacent concealed spaces by tight-fitting fireblocking in accordance with Section R602.8.
    5. Stud wall cavities in the outside walls of building envelope assemblies shall not be utilized as air plenums.
TABLE M1601.1.1
DUCT CONSTRUCTION MINIMUM SHEET METAL THICKNESS FOR SINGLE DWELLING UNITSa
ROUND DUCT DIAMETER
(inches)
STATIC PRESSURE
1/2 inch water gage 1 inch water gage
Thickness (inches) Thickness (inches)
Galvanized Aluminum Galvanized Aluminum
< 12 0.013 0.018 0.013 0.018
12 to 14 0.013 0.018 0.016 0.023
15 to 17 0.016 0.023 0.019 0.027
18 0.016 0.023 0.024 0.034
19 to 20 0.019 0.027 0.024 0.034
 
RECTANGULAR DUCT DIMENSION (inches) STATIC PRESSURE
1/2 inch water gage 1 inch water gage
Thickness (inches) Thickness (inches)
Galvanized Aluminum Galvanized Aluminum
≤ 8 0.013 0.018 0.013 0.018
9 to 10 0.013 0.018 0.016 0.023
11 to 12 0.016 0.023 0.019 0.027
13 to 16 0.019 0.027 0.019 0.027
17 to 18 0.019 0.027 0.024 0.034
19 to 20 0.024 0.034 0.024 0.034
For SI: 1 inch = 25.4 mm, 1 inch water gage = 249 Pa.
  1. Ductwork that exceeds 20 inches by dimension or exceeds a pressure of 1 inch water gage (250 Pa) shall be constructed in accordance with SMACNA HVAC Duct Construction Standards-Metal and Flexible.

M1601.1.2 Underground Duct Systems

Underground duct systems shall be constructed of approved concrete, clay, metal or plastic. The maximum duct temperature for plastic ducts shall not be greater than 150°F (66°C). Metal ducts shall be protected from corrosion in an approved manner or shall be completely encased in concrete not less than 2 inches (51 mm) thick. Nonmetallic ducts shall be installed in accordance with the manufacturer's instructions. Plastic pipe and fitting materials shall conform to cell classification 12454-B of ASTM D1248 or ASTM D1784 and external loading properties of ASTM D2412. Ducts shall slope to an accessible point for drainage. Where encased in concrete, ducts shall be sealed and secured prior to any concrete being poured. Metallic ducts having an approved protective coating and nonmetallic ducts shall be installed in accordance with the manufacturer's instructions.

Related Code Sections


M1601.1 Duct Systems, Duct Design
be designed to limit discharge air temperature to not greater than 250°F (121°C). Factory-made ducts shall be listed and labeled in accordance ...
2015 Michigan Residential Code > 16 Duct Systems > M1601 Duct Construction > M1601.1 Duct Design
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When a common multistory duct system is designed and installed to convey exhaust from multiple clothes dryers, the system shall be engineered ...
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When a common multistory duct system is designed and installed to convey exhaust from multiple domestic kitchens, the system shall be engineered ...
2015 Michigan Mechanical Code > 5 Exhaust Systems > 505 Domestic Kitchen Exhaust Equipment > 505.3 Common Exhaust Systems for Domestic Kitchens Located in Multistory Structures
603.3 Duct Systems, Duct Classification
or 10.0 inches (1 inch w.c. = 248.7 Pa) of water column. The pressure classification of ducts shall equal or exceed the design pressure of the air ...
2015 Michigan Mechanical Code > 6 Duct Systems > 603 Duct Construction and Installation > 603.3 Duct Classification
513.10.2 Exhaust Systems, Ducts
Duct materials and joints shall be capable of withstanding the probable temperatures and pressures to which they are exposed as determined ...
2015 Michigan Mechanical Code > 5 Exhaust Systems > 513 Smoke Control Systems > 513.10 Equipment > 513.10.2 Ducts
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