Quote Originally Posted by Tiger93rsl View Post
Yea I got a little ahead of myself on that one, and come to think about I have seen a few p traps installed on newer RTU's but it's not very common to see them installed on older units.

there were a few versions of Carrier RTU's that came with a built in P-trap installed at the factory

aside from those all of the other RTU's without a built in P-trap do drain better with traps

also with P-trap's installed it will eliminate pulling in unwanted hot ambient air!