The house I am looking at buying has a whole house trap in the 4" drain pipe after all the fixtures in the house but before the kitchen sink and dishwasher. I have never seen a whole house trap in a house before. The washing machine drain pipe has no trap and smells from time to time. I was told its from residual stuff on the 10' of drain pipe before the whole house trap and not gas from septic tank. Also right next to the whole house trap is a elbow and then an open 4" vertical pipe (between fixtures and whole house trap). I was told this is another vent and should just be vented through the stil in the basement or a pop up vent installed. Since its after all the fixtures it will not help with a the vacuum created when a toilet is flushed, so what is it there for?
If I install a trap in the washing machine drain line I am not sure how to vent it. Its the last fixture in the 4" drain pipe (farthest from septic).
Lastly, someone put a tee and in the attic connected the bathroom fan to the 4" vent stack via white flex hose. It may work, but just seems odd.
If I install a trap in the washing machine drain line I am not sure how to vent it. Its the last fixture in the 4" drain pipe (farthest from septic).
Lastly, someone put a tee and in the attic connected the bathroom fan to the 4" vent stack via white flex hose. It may work, but just seems odd.