7
axial, centrifugal and radial-type blowers for ventilating, circulating, exhausting, or delivering large volumes of a gaseous medium
11
peripheral systems for industrial and utility solid-fuel-fired boilers, namely, submerged scraper conveyors, submerged apron conveyors, flash drag conveyors, transfer conveyors, ashwater cooling units, mill reject sluices, ash storage silos, ash dewatering units, and ram ash extractors; parts for commercial fans and blowers, namely, dampers for control, isolation and environmental applications, namely, single and double louver dampers, twin blade dampers, guillotine dampers, environmental control system dampers and diverter dampers, namely, toggle arm, pivot, control, and isolation diverter dampers
17
resonance or absorption-type silencers and/or acoustic insulation for attenuating the noise associated with fans and blowers