When my furnace is operating ( heat mode ) the blower motor on high, the cold air return vents make a howling noise,( in my bedroom ) due to the suction of the blower motor, pulling the air thru the vent.
Is there a way to defuse the air being returned to( that particular vent ) the furnace, with out reducing the amount of air being returned to the furnace.
The duck work amplifies the noise, and it resonates in the bed room.
Thanks Tom