Serial Number LA010710786. Manufactured by Heat Systems – Ultrasonics Inc., 1938 New Highway, Farmingdale, NY 11735. Exhaust fan is Model HSB-50, Serial Number 86-1095. For horizontal cross flow scrubbing of a low flow gas, probably 100 cfm maximum. Constructed of non metallic contact parts: Plastic scrubbing chamber (probably polypropylene), plastic fan (probably cpvc), piping. Small circulating pump in the underneath polypropylene solution tank.