Very unique old compressed air powered exhaust fan. Haven’t seen an exhaust fan quite like it. Marked The JF exhaust fan. Made by DeVilbiss Mfg Co in Toledo Ohio. 20″ in diameter with 16″ diameter blades. Cast iron frame and base. Base is adjustable up and down and rotates. Has a piece of the front rotor cover broken off. Unfortunately I don’t have a big enough compressor to test it. Please contact me with any questions and check out my other items for sale.