Thread: Is this a proer p-trap for a HVAC condesation line. I see it a lot.

I see this p-trap a lot. It does not look like it is doing much sloping down hill like that. Obviously he needs a cleanout installed as well. What about the trap? Does it need to go like a " U" like a trap for a sink or would this be fine as long as it ws not on a slope.?

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Looks good

This is pretty shallow and has no vent, a "running" trap. Look at the a/c manufacturers requirements to know for sure. Most will specify a certain depth trap to overcome the pressure differential.

Originally Posted by Jim Luttrall

This is pretty shallow and has no vent, a "running" trap. Look at the a/c manufacturers requirements to know for sure. Most will specify a certain depth trap to overcome the pressure differential.

As Jim said, that's a 'running trap', those are not allowed.

Typically, the minimum trap seal (depth) required is 2", I've seen required depths of 3", 4", 5",