Fixtures & Water HeatersQuestion 187 of 360
A fuel-gas water heater installed in a small closet requires combustion air primarily to:
a.cool the discharge pipe
b.supply oxygen for safe, complete combustion and proper venting
c.increase the water temperature
d.pressurize the expansion tank
Explanation
A gas burner needs adequate combustion air so fuel burns completely and does not produce dangerous carbon monoxide. Insufficient air also causes poor draft and backdrafting of flue gases. Confined spaces must be provided with openings or ducts sized for the appliance input.
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