Regenerative Blower, Appears to be a GAST R-AJ104GA. Casing is 16” in diameter and 5” wide, with a 3” Inlet and 3” outlet. The motor is most likely an 8 or 10hp; however the motor tag is missing. It is wired 220v 3ph. The unit is mounted on a carbon steel stand and sits 17” off the ground. Overall size is 38”H x 24” x 22”.