Thread: Unusual Air and Noise from Bath Sink - AC primary drain
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Old 07-29-2007, 01:05 PM
Phillip Stojanik's Avatar
Phillip Stojanik Phillip Stojanik is offline
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Location: Houston, Texas
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Re: Unusual Air and Noise from Bath Sink - AC primary drain
The primary drain line needs to have a vapor trap installed. The noise you are hearing is a ramped up version of a kid blowing into the straw of his drink. Stop the free flow of air and you will stop the noise and the bubbles.

Based on the static pressure of an HVAC system (without other problems), a simple drain line trap is enough to do that.
Last edited by Phillip Stojanik : 07-29-2007 at 01:11 PM. Reason: Like Richard said!
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