Hi, I have installed a Saniflo drain water pump in my basement kitchen sink. This drain pump is required to be vented to a 2 way air vent and unfortunately cannot used with an AAV. I have vented the unit and connected it to an existing vertical vent pipe in my utility room. The pump seems to work fine, however my concern afterwards was that I may have installed the vent pipe in the wrong direction. I issue is i had to take the vent pipe up and over an object then come back down on a downward slope connecting to the vertical vent pipe. Would a downward sloping vent pipe affect the air from venting properly? I have attached a picture for reference. Thanks