Furnace exhaust pvc pipe noise. It comes out of the funace goes up a few feet then runs horizontal a few feet then continues vertical through the ceiling. Once the hot water stops flowing through the pipe the PVC begins to cool and contract. Take a mental note of where they exit the building and head outside. In contrast modern high-efficiency condensing furnaces exhaust much cooler gasses and need only plastic pipe materialssuch as PVC CPVC or ABSfor their exhaust vents. Vibration can be carried up the pipe as well so youll need to lay a hand on it or a cell phone say and listen to the pipe. Suck out the water with my shop vac and the furnace runs fine for about a day then I need to repeat the process. Once outside look for the intake and exhaust pipes. I have actually gone to the furnace and felt the PVC pipe shake.
Its doesnt seem to happen during the day Im guessing because its above freezing but at night the PVC pipe makes a very loud popping noise. Because so much heat is removed from the gases and used to heat your home hence the high-efficiency rating it cannot rely on natural draft to exhaust flue gases through a vent. Yet there are other cases where chipmunks commonly bring seed into an unprotected exhaust vent pipe and the inducer motor attempts to grind the seeds up when the furnace receives a call for heat. You dont indicate what climate zone youre in but if its snow country be sure that the exhaust pipe is high enough or protected enough that it wont get buried in snow. So neighbor next door had to get new furnace two weeks ago. Upon investigating I discovered that the loud gurgling sound was actually coming from a pvc pipe that attached to the furnace gas powered. The problem is the noise is very loud in my master bedroom and is very close to my head when Im trying to sleep and keeps me awake at night.
Wasnt really paying attention – but later in week kept hearing an annoying sound off and on throughout the night. I have actually gone to the furnace and felt the PVC pipe shake. That can cause a CO problem in the house before the furnace shuts itself down due to. In this case the grinding is often so loud that it can be heard throughout every level of the average home and easily tips off the occupants that there is a major problem.