VENT TERMINALS
Philadelphia Code Subcode P, § 903
in effectSECTION 903 VENT TERMINALS
903.1 Roof extension. The vent pipe shall terminate by extending to the outdoors through the roof or the side wall in accordance with one of the methods identified in Sections 903.1.1 through 903.1.4.
P-903.1.1 Roof extension unprotected. Open vent pipes that extend through a roof shall be terminated not less than [NUMBER] 24 inches (610 mm) above the roof.
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P-903.2 Reserved. Frost closure. Where the 97.5-percent value for outdoor design temperature is 0°F (- 18°C) or less, vent extensions through a roof or wall shall be not less than 3 inches (76 mm) in diameter. Any increase in the size of the vent shall be made not less than 1 foot (305 mm) inside the thermal envelope of the building.
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Source: City of Philadelphia, The Philadelphia Code and Home Rule Charter (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/philadelphia/latest/philadelphia_pa/0-0-0-312331Fetched: 10/27/2026