The purpose of a vent is to break the siphon action after the trap (a toilet has a built-in trap). Without a source of air on the outgoing side of the trap the water in the trap will be siphoned out leaving a dry trap where sewer gases can enter the room. Have you ever, in a older house perhaps, heard a sink go gurgle, gurgle, gurgle when draining? That is air being pulled thru the trap. I believe it is allowed to go up to 5 feet from the toilet to a vent. Usually the other traps "dump" into a pipe where it continues up as a vent pipe.
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Posted by: David Cox <dcwired@att.net>
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