Snow clogged PVC


Old 02-02-04, 04:29 PM
Ken Baker
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I moved into a house with a high efficiency (Carrier 9200) natural gas furnace. Recently, extremely cold weather has caused the PVC air intake to clog up with ice/snow & the lack of airflow does not allow the burner to ignite. Both intake & exhaust pipe are at least 5 feet above the ground (well above snow accumulation) & the elbow of the intake is properly facing down. Sometimes I have to clear the pipe twice a day. Is there any way to prevent this?

Last edited by twelvepole; 02-03-04 at 08:33 AM.
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Old 02-02-04, 06:20 PM
KField's Avatar
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Find out where the moisture comes from and eliminate it. There must be a source of moisture to make that much ice.
Old 02-03-04, 07:17 AM
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How are the pipes set up outside?

Is the exhaust higher/lower than the intake pipe?

Intake just faced down?
Old 02-03-04, 08:32 AM
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Air intake

Is there a pig tail on the air intake to trap condensation that could be freezing and blocking the intake? Some heating units have air intake and exhaust pipes near each other on the outside. The warm, humid air passing the intake pipe condenses and freezes during extreme cold. Hot water can be poured on intake pipe or blow dryer used to heat and thaw the pipe. And electric heat tape may be helpful.

A carbon monoxide detector is recommended for your protection. It is extremely important that your system receives fresh air from the outdoors for proper combustion.
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