When you flush tiolet or let water out of tub or sink, if the vent is working properly will it force air out of the vent?

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Originally Posted by bskinner57

when you flush tiolet or let water out of tub or sink, if the vent is working properly will it force air out of the vent?

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No, It pulls air in. When you flush or drain, the water draining down the pipe creates a suction. This suction is relieved by the air entering a vent. Cheers, Tom