How well are the pipes sealed to the outside? If you have a full basement and the temp is 60 degrees in that basement, I really don't care all that much what is around it. Taking air that is -40 outside and immediately sucking into a space that is 60 degrees (or even lower) that pipe is going to produce water. Cold ALWAYS produces water (condesate) ON THE WARM SIDE. Try this, go grab a nice cold can of soda out of the fridge, and set it on the kitchen table. Wait a few and watch water droplets appear on the outside of the can and drip down on the table. Just like that cold intake pipe passing through the warmer basement. Or, go out into your shop and grab a PVC fitting, toss it in the freezer (thatââ¬â¢s typically zero F) let it stay in there 15 minutes, take it out set it on the table, you will see tiny droplets of water appear, again just like your pipe dripping on the floor. You may even have a leak around the wall penetrations. I would hope not at those temps. Sometimes with an oil burner thatââ¬â¢s a direct vent, with an intake pipe for combustion air going directly to the burner will cause it to shut down because of the extreme delta T. Insulating that pipe will solve the problem. -40 degrees going into 60 degrees is going to cause some condensate on the pipe, and then drip on the basement floor. just my .02