View Full Version : HVAC squirrel cage blower whistle noise.

Nov 21, 2018, 06:03 AM
I just had a motor replaced in a HVAC squirrel cage air blower. The blower now makes a kind of whistling sound along with the normal moving air sound. The sound seems to pulsate and is annoying. I know the technician has the rotor off center. I.e. there is a big gap on one edge of the housing and a very small one on the other side. Could this off center positioning be the cause?

Nov 21, 2018, 01:21 PM
It well could.

Nov 21, 2018, 06:29 PM
Make them center the cage properly. You are getting unbalanced flow that could cause the noise you note.