THESE ARE FURNACE BLOWER ASSEMBLIES, REMOVED FROM CENTRAL AIR GAS FURNACES.110 VOLT UNITSTHESE INCLUDE A BRAND NEW MOTOR INSTALLED ON A USED ASSEMBLYSQUIRRELL CAGE, MOTOR, AND HOUSING ASSEMBLYVERY POPULAR FOR USE AS SHOP FANS AND VENTILATORS110 VOLT FOR EASY PLUG-IN WIRINGI HAVE SEVERAL, YOURS WILL VARY FROM PICTUREMOST ARE 3 TO 5 TON (AC) SIZENEED A SCECIFIC SIZE TO REPLACE YOUR EXISTING FURNACE ASSEMBLY? CONTACT ME WITH OPENING DIMENSIONS, AND I'LL MATCH AS CLOSE AS POSSIBLE.RUN TESTED AND WORKING GOODREPLACEMENT BLOWERSFOR THOSE LOOKING FOR A BLOWER TO REPLACE YOUR EXISTING GAS FURNACE BLOWER:TECH TIP; MATCH THE WIDTH, MATCH THE BLOWERTYPICALLY, ALL BLOWERS HAVE THE SAME DIMENSIONS, EXCEPT AS THE BLOWER GETS BIGGER, IT GETS WIDERMOST ALL BLOWERS HAVE AN AIR OPENING THAT IS 11 1/2 TO 12 INCHES LONG.BUT THE AIR OPENING WIDTH, WHICH IS THE SAME AS THE BLOWER HOUSING WIDTH, IS ABOUT 8 INCHES IN A 2 TON, 50,000 BTU FURNACE BLOWER, GOES TO 16 INCHES IN A 125,000 BTU, 5 TON BLOWER. THE RADIAL DIMENSIONS GET A BIT LARGER AS THE BLOWER GETS LARGER, TOOPLEASE PROVIDE THE OLD BLOWER WIDTH, SO IT CAN BE MATCHED AS CLOSE AS POSSIBLE. BLOWERS WITH MATCHING WIDTH HAVE MATCHING CFM CAPACITY, SO A SIMILAR WIDTH BLOWER WILL WORK. THE REPLACEMENT BLOWERMAY NOT BE EXACT, SO SPECIAL MOUNTING MAY HAVE TO ADDED TO SECURE THE BLOWER