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What is a venting for on drains and what if you can't go up through the roof to vent the drains?
Wiki User
∙ 16y ago
Traps are installed at Plumbing fixtures to protect the premises and occupants from offensive and hazardous gasses. Vents are installed immediately adjacent to the traps to protect the trap from losing its water seal from the syphonic action caused by the draining water running through it. They are necessary for the plumbing system to work properly and safely. If you cannot carry the vent through the roof, some states and municipalities allow the use of an "air admittance valve", sometimes called a "johnny vent" in lieu of a vent-thru-roof. It is a small and inexpensive (plastic and rubber, under $10.) device consisting primarily of a spring loaded rubber disc which closes to pressure pushing out from within and opens to suction, which happens when the fixture is draining, or finishing the drain cycle. A trap seal loss can allow carcinogenic and flammable sewer fumes fumes to enter the home.
The use of AAV's sometimes called pro vents are illegal to use in the better plumbing codes as one would be kind of fool hardy to trut a spring and a piece of rubber to protect ones health.
Even the codes that do allow these garbage connectors do have certain requirements and restrictions.
A Vent through the roof is the best way to go and depending on weather conditions you may be required to use a 4" pipe to prevent hoarfrost
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Wiki User
∙ 16y ago
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How are metered roof drains used?
Metered roof drains are installed on flat roof systems. Their primary purpose is to allow a small amount of water to drain through them, and allow for water to pool on a roof top. This pooling allows for the sewage treatment plants not to be overwhelmed by the rain water. The metered roof drains must be spaced 50 feet from the roof edge and 100 feet from another metered roof drain. Each metered roof drain has 4 weirs built into its body. By removing weirs you can control the amount of water that will drain. The more weirs removed the faster the roof will drain. The roof must be engineered to hold the weight of the pooling water. More information can be found on the web sites from the manufacturers of metered roof drains. Zurn, Mifab etc.
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Can the roof venting of a toilet be upstream of the toilet flange?
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Where do you install venting on porches if you have already installed soffit vents all the way around the porch?
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You cant you have a roof you just cant see it now go play your game Answered by death
