SBD TANK TYPE HEATERS
SERVICE HANDBOOK
EXTERIOR CLEARANCE
"Copyright by the American Gas Association. Used by permission of the copyright holder".
This illustrates the exterior roof clearances for SBD units with natural draft venting. The vent shall extend at least 3 feet above the highest point where it passes through a roof of a building, and at least 2 feet higher than any portion of a building within a horizontal distance of 10 feet (for vents of 12" in diameter or less). (NFPA 54 ANSI Z 223.1 SEC 7.5.2a). (Sec 7.6.2a may allow reduction to 8 feet with a “ Listed vent cap”).
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