Furnace Blower Motor & Fan Housing Assembly 220 V ac Motor Tested. Variable 3 speed 1/3 HP. Duct Dimensions approx 8″ x 10 “. Total Housing 16 1/2 high, 17 1/2′ long and 11” wide. Internal AC Motor Capacitor start. MATCH THE WIDTH, MATCH THE BLOWER. TYPICALLY, ALL BLOWERS HAVE THE SAME DIMENSIONS, EXCEPT AS THE BLOWER GETS BIGGER, IT GETS WIDER. MOST ALL BLOWERS HAVE AN AIR OPENING THAT IS 11 1/2 TO 12 INCHES LONG.