My house smells like sewer gas when the heat is coming out of the vents. I am not a HVAC expert but it seems strange that the air handler would have a PVC pipe connected to a plumbing vent. Could the sewer smell be traveling backwards and into the air handler through the PVC pipe? What is the purpose of the PVC pipe - I know the PVC connected to condensation pan goes directly outside - but what is the other PVC pipe that connects to the side of the air handler for?
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