Loud hvac air return. Loud blowing air and fan noise. How to fix?
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If this has been an ongoing problem the system may be undersized. If it just happened recently: filter changed, all vents open, ductwork in good condition. Too many variables to determine with out diagnosing.
http://www.pvhvac.com/blog/noisy-air-ducts-heres-make-quieter/
https://www.hannabery.com/faq25.shtml
https://www.youtube.com/watch?v=Gr4XaQ8rr9A&pbjreload=10
you can build a plywood box to fit over the unit, lined with eggcrates, or with insulation to deaden the sound. You can wrap the pipes through which the air moves with insulation and Tuck Tape. this will cut down the sound dramatically.
You might want to see what level your fan speed is. Ours was set incorrectly, had the same problem. Hope this works. By the way, the technician set ours at auto.
Also, clear all your outside vents. Perhaps something got into your vent.
Isn't it supposed to have a filter behind the vent grill?
Glad the vents are clear.
If it's supposed to there will be brackets to support filter. My mom's house had one on return grate and at the heat/AC unit itself.
If your HVAC fan make very loud noise then it might happen due to several issues. To get rid of the noisy HVAC machine sounds you should follow the given steps ;
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