84-6-RC - Draft Control w/Collar Field ControlsRheem 84 6 RC Draft Control w Collar Field Controls The Rheem 84 6 RC Draft Control with Collar by Field Controls is designed to regulate and stabilize chimney draft in oil and coal fired heating systems. Commonly used on residential and commercial furnaces and boilers, this barometric draft control helps improve combustion efficiency, maintain consistent draft levels, and reduce excessive heat loss through the flue. The included collar allows for
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