Hello all. Thanks in advance, great forum for info to us homeowners...I already know the manuals say do not do it, but several professionals have offered differing opinions. So I want to state that I already know its wrong, but I have to do it anyway! I am in a high mice, bee, chipmunk, bird traffic area. I have placed a "PVC screen" over both pipes and am looking for advice on how stupid this actually is and if it will/can cause damage to my unit?
I have Lennox Elite G61 94% unit in Michigan. It is a brick ranch with a basement. The 2" vent in/out are about 12in up from the ground (I do get snow, but those pipes are as high as they could put them). Luckily, they are not in an area where drifts occur and usually no that high. Anyhoot...I know I would get mice or other creatures in there so I took a PVC drain (normally used for shower drains/utility sinks) and capped it off at first. This seemed to be fine on the outlet, but the inlet starting wistling so obviuosly not enough air getting in. I then took a 2" to 4" adapter, bought the 4" drain and capped it off (could have used the 2 to 6 but wanted to go as small as possible for looks). It all seems to be working great now. The 4" pipe with the PVC screen is much larger than the 2 so the surface area with the screening is probably about the same diameter as the original 2" without screen. Does anyone forsee any problems besides freezing--I say that because since it is a well heated basement, I think enough heat radiating from the walls and pipes will prevent a lot of the freezing (Im in zone 5). I know this got long, but thank you for all comments!!