As I understand it, as water flows down the sewer line, it pushes the air out the vent eliminating an air lock.
Therefore, I'm thinking that the vent needs to be located as close as possible to the 4" stack in the basement as I can get. (This is attainable as we just had a new stack put in this summer). However, would the existing vent located off of the first floor sink do the trick since it is located off of the first floor and not the basement?
Secondly, is 1¬Ω" PVC adequate, or does it need to be 2"? This is residental, with a septic system.
Thanks in advance,