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RESIDENTIAL GAS AND ELECTRIC WATER HEATER
SERVICE HANDBOOK
FLAME ARRESTOR
Made from Corderite, a fireproof ceramic material, the flame arrestor is built into the base of the water
heater. Combustion air is drawn in through the LDO screen (s). After entering the bottom area of the
water heater, this air passes up through the small ports of the flame arrestor and into the combustion
chamber.
In the event flammable vapors are introduced accidentally into the combustion chamber, the flame
arrestor is designed so any flames burn off the top surface of the arrestor and cannot escape down
through the arrestor. The arrestor works somewhat like a check valve.
Service:
Inspect the bottom ports of the flame arrestor by removing the LDO screen (s) and using a mirror
and flashlight. Clean the ports if necessary by vacuuming the bottom of the arrestor.
Inspect the top of the flame arrestor by removing the inner door and burner assembly. Lift the heat
shield located on the bottom of the chamber. Inspect with the mirror and flashlight. Vacuum or blow
down any blocking material. If you blow down through the ports, be certain to also vacuum below
the arrestor.
A.O. Smith Water Products Company Technical Training Department
©2005 Ashland City, TN
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