I live in upstate New York in an apartment building. The vent pipe on the outside of the house is only 2 feet on the side of the house. We get real bad septic gas smells in our bathtub. My husband and myself don't know the how far on the roof it should go. We do know that it is not proper where it is. If anyone knows out there please let us know right away as our bedroom is right off the bathroom. Thank you