Recently I posted about P- traps. I was in the supply house this week and decided to take a picture of all 3 traps they sell and compare. Top is not code approved, never use it om comfort cooling. Middle is ok, as long as your static pressure on that side of the system is under 0.5". Bottom is very good as long as you have the room for it. Crawlspaces here in the Southeast U.S. may not give you the room without digging out below.

Posted by TimDestasioHVAC at 2021-03-06 15:45:36 UTC