Add to Cart The item has been added Johnson Furnace Blower (1B5145) Replacement Blower for Johnson Furnaces. Outside measurement of the mounting flange is 9 1/2 x 5. There are 6 holes in the the flange, 3 on the top and 3 on the bottom. This is a 463 CFM blower... $227.61 Add to Cart The item has been added