I have a wall mounted high efficiency boiler. It is direct vented with 3 inch PVC outside the house. I am going to be adding a sink and need to vent it quickly, can I tie into this, or will it cause my boiler to run less efficient?
If I cannot tie into this I am wonder if anyone knows if an AAV is legal in Minneapolis, Minnesota? I would prefer to not have to redo this in the future:)