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[quote=Anonymous][quote=Anonymous]Modern high efficiency gas furnaces have two pipes to the outside - an air intake pipe (so it doesn't use your heated air) and an exhaust pipe. Neither should be venting inside. Could be a pressurized condensate drain from when it's running A/C: https://hvac-talk.com/vbb/threads/2183801-Condensate-drain-line-blowing-cold-air[/quote] Our HE furnace has a condensate drain for both heating and cooling. It goes to a pump that is pumped through a tube into our set tub.[/quote]
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