Specifications

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stcudorP retaW htimS .O .A Service Workbook
Ashland City, Tennessee 2005© Training Department
EXTERIOR VENT CLEARANCES
CATEGORY I INSTALLATION
This illustrates the exterior roof clearances for Genesis unit with vertical draft venting. A gas
vent shall terminate above the roof surface with a listed cap or listed roof assembly. All other
gas vents shall terminate not less than 3 ft (0.6 m) above the highest point where they pass
through the roof and at least 2 ft (0.6 m) higher than any portion of a building within 10 ft. (3.1
m). (NFPA 54/ANSI Z223.1)
Section 7.6.2 "within 8 ft (2.4m) with listed caps for vents of 12 inches diameter or smaller".
“Copyright by the American Gas Association. Used by permission of the copyright holder”.
When installed as a direct vent system, follow the manufacturer’s recommended clearances.