Sink vent
I'm doing a kitchen remodel and have an opertunity to get rid of the "cheater valve" and run a real vent. My question is, do I really need to run 1 1/2" pipe for just the vent or could I reduce it dow...
Forum Discussion
Old-Biscuit wrote:
AAVs are downstream of 'P' Traps so they do NOT get sucked dry from negative pressure created in sink drain line when DUMPING waste tank
Don't have room for 1 1/2" vent line to roof.....then upgrade and use a better AAV
Volume/weight of water being drained WILL overwhelm a small vent line and could collapse waste tank.
Fresh water tank can use smaller vent lines due to relatively slow water removal
I'm not planing on venting the tank with this 3/4 pipe, just the kitchen sink. The tank has a 1 1/2" factory installed vent out the roof already. I just was wanting to do away with the "air admitance" valve that was under the sink. Anytime anyone has a smell, that's the first thing everyone says to check. They go bad. I was just thinking I could do away with a "future problem" by venting the sink externalally out the old fridge vent. I have to go on the roof and seal that old vent off anyway. I was thinking about dropping a 3/4" flexable hose down behind the fridge, connecting it to the sink Tee with a adapter and using it to vent the sink. I have a residential refrigerator now so the roof fridge ent needs sealed up anyway.
