Question

blowing with the very high speed produces whistling sound of very high____. (fill in the blanks)

Answer 1

blowing with the very high speed produces whistling sound of very high PRESSURE

Answer 2

Escaping Air. A whistling noise caused by the furnacemeans that air is escaping somewhere in the system. It may a new or rebuilt fan that is forcing air through the ducts with more force, or it could be a loose connection in the ducts.