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// CODE SNIPPET

507.4.7 Building and Structural Contact

California Mechanical Code 2019 > 5 Exhaust Systems > 507.0 General Requirements > 507.4 Clearance > 507.4.7 Building and Structural Contact
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A duct shall be permitted to contact noncombustible floors, interior walls, and other noncombustible structures or supports, but it shall not be in contact for more than 50 percent of its surface area for each lineal foot of contact length. [NFPA 96:4.4.1]

507.4.7.1 Corrosion Protection

Where duct contact must exceed the requirements of Section 507.4.7, the duct shall be protected from corrosion. [NFPA 96:4.4.2]

507.4.7.2 Zero Clearance

Where the duct is listed for zero clearance to combustibles or otherwise protected with a material or product listed for the purpose of reducing clearance to zero, the duct shall be permitted to exceed the contact limits of Section 507.4.7 without additional corrosion protection. [NFPA 96:4.4.3]

Related Code Sections


507.3.7 Exhaust Systems, Building and Structural Contact
A duct shall be permitted to contact noncombustible floors, interior walls, and other noncombustible structures or supports, but it shall ...
California Mechanical Code 2016 > 5 Exhaust Systems > 507.0 General Requirements > 507.3 Clearance > 507.3.7 Building and Structural Contact
507.4.7 Exhaust Systems, Building and Structural Contact
A duct shall be permitted to contact noncombustible floors, interior walls, and other noncombustible structures or supports, but it shall ...
California Mechanical Code 2019 > 5 Exhaust Systems > 507.0 General Requirements > 507.4 Clearance > 507.4.7 Building and Structural Contact
1217.2 Hydronics, Radiant Under-Floor Heating
Floor surface temperatures shall not exceed the following temperatures: 85°F (29°C) in dwellings, buildings, or structures. 85°F (29°C ...
California Mechanical Code 2016 > 12 Hydronics > 1217.0 Radiant Heating and Cooling > 1217.2 Radiant Under-Floor Heating
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