This is a Dayton blower wheel less motor (available seperately).
overal frame dementions 21" x 20", wheel 12" diameter x 6" wide. Pulley operated. Used in a super clean filteration system, so the cleanliness you see in the picture is as it was removed without cleaning. 2 available Priced each or both for $70. Flanged to connect to ductwork (some still attached in pic.).
Can be used in a ventilation or heating/air conditioning set-up. 2000 to 3000 CFM output depending on HP of motor (1/2 to 1 1/2).