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-   -   Replaced a cold air return grid, now furnace makes a squealing sound (http://www.askmehelpdesk.com/heating-air-conditioning/replaced-cold-air-return-grid-now-furnace-makes-squealing-sound-751404.html)

  • May 30, 2013, 12:33 PM
    diyhrh64
    Replaced a cold air return grid, now furnace makes a squealing sound
    I replaced a cold air grill cover and now the furnace makes a squealing sound every time it kicks on, whether for heat or air conditioning. I remove the grill cover and the sound stops?
  • May 30, 2013, 02:13 PM
    ma0641
    Squeal or whistle? Is this a straight return cover or over a filter? Somehow you are apparently getting a harmonic resonance. Try bending the grill vanes a bit to change the air flow pattern.

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