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This metal-to-metal seal design minimizes thermal drift
Optimized Thermal Regulation: The direct acting mechanism ensures immediate response to temperature fluctuations between 160°F and 205°F
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the thermostat shifts internally to the night set point
Weil McLain 381-800-477 Vent Damper 319847-401 This metal-to-metal seal design minimizesWhen you are servicing gas fired systems, the Weil McLain 381 800 477 7 inch vent damper is the critical OEM component required to maintain proper draft and combustion efficiency. This automatic vent damper is the verified direct replacement for the legacy Weil McLain 510 512 347 model. Engineered specifically for boiler venting systems, this unit facilitates fuel savings by closing the flue during the off cycle to prevent standby heat loss, while