Kitchen Sink Venting Requirements

Moreover code watcher advises that since 2009 the international residential code irc includes a section on air replacement for houses with active kitchen ventilation. The p trap must be vented and the vent connection should be as close to the trap as possible but no closer than two pipe diameters which is 3 inches for a 1 1 2 inch trap. Both kitchen 1 1 2 inches and bathroom 1 1 4 inches are smaller than the rest of the drain system on purpose.

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Things needed 2 sanitary tees plastic pipe cement pvc pipe and fittings 1 1 4 inches in diameter hacksaw.

Kitchen sink venting requirements. Some state building codes do require mechanical ventilation such as an exhaust fan in the kitchen. Because the main stack is also vertical it will rarely clog. Because ventilation requirements vary from state to state and even from city to city it s important to check with local authorities or with a local hvac professional if you have questions. They lead into larger branch drain pipes which lead into the 4 inch stack.

The general rule is that smaller drainpipes 1 1 4 inches for bathroom sinks and 1 1 2 inches for kitchen sinks for instance lead to larger branch drains. When installing your vents it s highly recommended that you plan out your drain lines to minimize the risk of clogging. Additionally the vent can be no farther than 6 feet from the weir of a standard 1 1 2 inch trap. These in turn lead to the main stack which is the largest pipe of all typically 4 inches.