The WMO-1 blocked vent switch is recommended for installation with an oil fired appliance that normally operates with its vent system under a negative pressure. This device is intended to detect a blocked vent system, responds to hot flue gases backing up through its heat transfer tube, and can be wired to shut off the oil burner. It requires manual resetting. By installing the WMO-1, you can ensure safe and efficient operation of your oil-fired appliance, while also protecting against potential hazards caused by blocked vents.

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