I have 2 sump pump pits in the basement, one at each end of the basement about 70 feet apart one in the front corner basement one in the back corner. The one in the back has a radon pipe that vents out of the roof and the 1 ½ inch pipe to pump the water out. The one in the front corner of the basement has the 1 ½ inch pipe to pump the water out but also has a 1/12 vent pipe that goes out to open air. Why does it have the vent pipe and the other one does not?
I ran 3 inch pipe from my radon pipe to connect it to the other sump pump pit so it would pull the radon from both pits. I also put a plug over the 1 ½ inch vent pipe thinking it would give more of a vacuum pull on the radon fan. Now I am thinking maybe leaving the vent pipe open it may help out with pulling in fresh air under the foundation helping clear out any radon.
So I am asking what would be the best way and why only 1 sump pump had a 1 ½ inch vent in the first place. Thanks