Payne
Backdraft or Infiltration Through Ducts
Furnace operates but there is noticeable cold air infiltration or drafts near registers when the system is off.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Leaky return ducts in unconditioned spaces, disconnected ducts, missing duct insulation, improperly sealed furnace cabinet
How to Fix / Troubleshooting
Safety first: Use caution when accessing attics or crawlspaces.
- Inspect accessible ducts: Look for disconnected or damaged ducts near the furnace and repair with appropriate metal tape or mastic.
- Seal cabinet gaps: Use approved foil tape to seal obvious air leaks at cabinet seams (do not cover service panels or labels).
- Add duct insulation: Insulate exposed metal ducts in unconditioned spaces to reduce cold air infiltration.
- Have duct system evaluated: A professional can perform a duct leakage test and recommend sealing improvements.
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Repair Difficulty
Medium
3/5
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