BTC 120-500 - AO Smith Water Heaters
BTC 120-500 - AO Smith Water Heaters
BTC 120-500 - AO Smith Water Heaters
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<strong>BTC</strong> TANK TYPE HEATERS<br />
SERVICE WORKBOOK<br />
Stoichiometric or theoretical complete combustion requires 10 cubic feet of air per 1000 BTUH<br />
input of the gas input. The National Fuel Gas Code also recommends an additional 2.5 cu.ft. of<br />
"excess" air. This 12.5 cu.ft minimum supply air per 1000 BTUH input applies to natural and<br />
propane gas models.<br />
The National Fuel Gas Code also specifies minimum make-up air opening sizes for various<br />
building installations. (Ref: NFPA 54, ANSI Z223.1)<br />
A.O. <strong>Smith</strong> <strong>Water</strong> Products<br />
Irving, Texas ©1998<br />
5<br />
Service Workbook<br />
Training Department
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