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Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
But the "Air admittance valve" section does not make sense -- if it only allows gases in, not out, how does it prevent back-pressure when a toilet flushes?69.87.193.156 13:05, 6 September 2006 (UTC) It doesn't. This, and its requirement for maintenance, are a couple of the reasons they're not liked by some (ahem... a lot of) building codes.
The New York Codes, Rules and Regulations (NYCRR) contains New York state rules and regulations. [1] The NYCRR is officially compiled by the New York State Department of State 's Division of Administrative Rules.
In the United States, plumbing codes usually provide strict limitations on how far a trap may be located from the nearest vent stack. When a vent cannot be provided, an air admittance valve may be used instead. These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap).
Today's NYT Connections puzzle for Saturday, January 11, 2025The New York Times
The New York City Department of Buildings (DOB) is the department of the New York City government that enforces the city's building codes and zoning regulations, issues building permits, licenses, registers and disciplines certain construction trades, responds to structural emergencies and inspects over 1,000,000 new and existing buildings.
It's awards season for college football. Here's a list of the award winners in 2024.
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