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(And they stink.) You do not want them in your home. The gases you might smell from a sewer are a combination of methane, carbon monoxide, hydrogen sulphide, nitrogen and many others that in combination can be toxic, corrosive, volatile or even combustible. That would allow sewer gases to seep into your home, which are both smelly and potentially very dangerous. If your home's plumbing wasn't vented at all, every time you drained a sink or flushed a toilet, water that was in the traps of the other fixtures in your home would be sucked away too, leaving the trap dry.
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The plumbing in your home is vented - you can see the vent stack sticking up about 12 inches on your roof (you might have more than one.) This stack vents sewer gases up into the air and provides some pressure to "equalize" the system.Įach fixture is connected to a stack that vents outside, and each fixture also has a P-trap that holds water and won't allow gases to escape back into your home from the main stack. But if you put a hole in the bottom of the bottle the water will pour out easily because air is able to flow into the bottle as the liquid spills out. That's because there's no vent, no air behind the liquid.
#Ontario building code plumbing vents full#
Think of a pop bottle: If you have a full bottle and you remove the cap and then turn it upside down, what happens? Not much - the water doesn't drain easily. The problem could be improper venting, or your vent stack could be blocked with leaves or covered with snow. If your sink drains slowly, it might not be plugged. Without vents, the fixtures can't 'breathe' and won't drain efficiently. Drains work basically by gravity, so waste and water flow down and out of your house.īut in order for your drains to work properly, each fixture - that's every sink, washing machine, dishwasher, toilet - has to be vented. You understand the importance of the drains in your home: They carry waste and water away from your toilets, sinks and appliances into the municipal sewer system. Canwest News Service/An air admittance valve, or cheater vent, is not always allowable by code and should only be used as a last resort, like a kitchen island sink, which can't vent any other way.