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To vent off odors emanating from the septic/sewer system and to allow the toilet to flush correctly and the other drains to empty correctly.
Yes if the vent pipe is 4" and vertical by code and there is nothing connected between your toilet tee and where you would connect your new toilet tee. If not worried about codes then yes you can connect to a 3" vent line if no other vent lines are connected down stream. If you have a vent pipe that is less then 3" and or you have other vents connected between your old toilet tee and your new toilet tee then NO you can not connect a new tee for your toilet.
by the vent shaft
it is a vent that is in the center obviously
Vents in case of toilet which is also referred to as the venting system. Vents also help to bring oxygen into plumbing system, which assists with the aerobic sewage digestion that is necessary for breaking the waste down and prevents sewer gases from getting into your home. It would be placed somewhere within a five foot radius of the appliance of your toilet. alliedallcityinc.com
there is a side vent and main vent on most volcanoes. some just have a main vent
A pipe that vents fumes
WHICH VENT If you're talking plumbing roof vents or soffit or ridge attic air vents; absolutely not!! I can't thing of a single vent that would be opened and closed at will.
the ducts can not be hooked up for the vents to work
No. Volcanoes have vents. Vents are holes though which ash, gas, and lava can erupt.
it has 2 vents.
Yes as ALL fixtures need to have the vent placed above the FLOOD LEVEL RIM