2006-07-20 09:57:47 · 3 answers · asked by luagui 1 in Home & Garden ➔ Maintenance & Repairs
dirty filter, dirty filter, dirty filter. Got it?
2006-07-20 11:04:39 · answer #1 · answered by Anonymous · 0⤊ 0⤋
On some older furnaces there was an adjustable pulley attached to the motor shaft that runs the blower cage. I have seen the set screw that holds the position of one side of the pulley come loose and change the distance between the sides. If it changes to smaller that makes the cage run faster and if it runs fast enough, the air can't escape thru the ducts fast enough and you will get a whistle sound. Just something to check
2006-07-21 21:27:02 · answer #2 · answered by Corky R 7 · 0⤊ 0⤋
generally this is caused by more air being pushed thru the ducts than they can handle. inspect the ducts and see if one is bent or damaged.
ps same principle as pursing your lips to whistle.. smaller hole, same air... whistle tooot, tooot
2006-07-20 17:02:44 · answer #3 · answered by Bullfrog_53 3 · 0⤊ 0⤋