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Technical Training Department ©2003
Ashland City, Tennessee
SBN TANK TYPE COMMERCIAL GAS WATER HEATER
SERVICE HANDBOOK
Exterior Clearance
The illustration below shows the required clearances for venting units using
natural draft venting.
Required Exterior Clearances
The vent must 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 inches in diameter or less).
References: NFPA 54 ANSI Z 223.1 SEC 7.5.2a and Sec 7.6.2a may allow reduction
to 8 feet with a “listed vent cap.”
“Copyright by the American Gas Association. Used by permission of the copyright holder”.