75075029
Mar 19, 1996
Nov 11, 1997
general ventilation equipment, namely, by-pass fans, radial blowers, ring fans, panel fans, stationary and portable pedestal and utility fans, upblast and hooded roof ventilators, recirculating and hooded roof ventilators, smoke ventilators and centrifugal exhausters; process ventilation equipment, namely, duct, duct axial and tubeaxial fans, vaneaxial and adjustable pitch vaneaxial blowers; centrifugal fans, namely, backward curved centrifugal and utility fans, square backward curved centrifugal fans, industrial and flange mounted industrial exhausters, pressure blowers, in-line centrifugal fans and plug fans; make-up air and heating equipment, namely, direct gas fired make-up air heaters, steam make-up air heaters, steam face and by pass make-up air heaters, direct gas fired door heaters, and steam unit heaters; marine and mine dust axial and vaneaxial fans, vaneaxial blowers for marine and mine use, mine booster fans; replacement centrifugal wheels and adjustable pitch fan blades and propellers, all for ventilation and heating equipment; and air control products, namely, fixed blade louvers, end-pivoted shutters and center-pivoted dampers, all for industrial and/or commercial use
Environmental Control Apparatus