This is a Carrier Blower housing, removed from an 58MXA060 furnace, Carrier assembly part # is 320788-702. It has this part # on the housing- 319816-402. It uses a 7" wide blower wheel.
Measures: 20 1/2" x 11" x 15". Inlet is 8 3/4" in Diameter, Outlet is 16 7/8" x 9 7/8"