Too much air flow is going through the return grill. The grill or ductwork may be too small or the blower motor is not calibrated for the needed air flow. Don’t live with it, this can be addressed by having the ducts and grills sized for the airflow needed and/or adjusting the blower speed to recommended settings.
Why does my furnace and air conditioner whistle?
April 11, 2016 by ·
