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// CODE SNIPPET

603.5 Nonmetallic Ducts

Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation > 603.5 Nonmetallic Ducts
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Nonmetallic ducts shall be constructed with Class 0 or Class 1 duct material and shall comply with UL 181. Fibrous duct construction shall conform to the SMACNA Fibrous Glass Duct Construction Standards or NAIMA Fibrous Glass Duct Construction Standards. The air temperature within nonmetallic ducts shall not exceed 250°F (121°C).

603.5.1 Gypsum Ducts

The use of gypsum boards to form air shafts (ducts) shall be limited to return air systems where the air temperatures do not exceed 125°F (52°C) and the gypsum board surface temperature is maintained above the airstream dew-point temperature. Air ducts formed by gypsum boards shall not be incorporated in air-handling systems utilizing evaporative coolers.

603.5.2 Phenolic Ducts

Nonmetallic phenolic ducts shall be constructed and installed in accordance with the SMACNA Phenolic Duct Construction Standards.

Related Code Sections


603.5 Duct Systems, Nonmetallic Ducts
Nonmetallic ducts shall be constructed with Class 0 or Class 1 duct material and shall comply with UL 181. Fibrous duct construction shall conform ...
Mechanical Code 2018 of Maryland > 6 Duct Systems > 603 Duct Construction and Installation > 603.5 Nonmetallic Ducts
415.11.11.2 Special Detailed Requirements Based on Occupancy and Use, Combustible Nonmetallic Exhaust Ducts
Automatic sprinkler system protection shall be provided in combustible nonmetallic exhaust ducts where the largest cross-sectional diameter ...
Building Code 2018 of Maryland > 4 Special Detailed Requirements Based on Occupancy and Use > 415 Groups H-1, H-2, H-3, H-4 and H-5 > 415.11 Group H-5 > 415.11.11 Automatic Sprinkler System Protection in Exhaust Ducts for HPM > 415.11.11.2 Combustible Nonmetallic Exhaust Ducts
415.11.11.2 Special Detailed Requirements Based on Use and Occupancy, Combustible Nonmetallic Exhaust Ducts
Automatic sprinkler system protection shall be provided in combustible nonmetallic exhaust ducts where the largest cross-sectional diameter ...
Building Code 2015 of Maryland > 4 Special Detailed Requirements Based on Use and Occupancy > 415 Groups H-1, H-2, H-3, H-4 and H-5 > 415.11 Group H-5 > 415.11.11 Automatic Sprinkler System Protection in Exhaust Ducts for HPM > 415.11.11.2 Combustible Nonmetallic Exhaust Ducts
603.1.1 Types of Construction, Ducts
The use of nonmetallic ducts shall be permitted where installed in accordance with the limitations of the International Mechanical Code ...
Building Code 2018 of Maryland > 6 Types of Construction > 603 Combustible Material in Types I and II Construction > 603.1 Allowable Materials > 603.1.1 Ducts
603.1.1 Types of Construction, Ducts
The use of nonmetallic ducts shall be permitted where installed in accordance with the limitations of the International Mechanical Code ...
Building Code 2015 of Maryland > 6 Types of Construction > 603 Combustible Material in Types I and II Construction > 603.1 Allowable Materials > 603.1.1 Ducts
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