6
Metal air duct fittings for use with air distribution systems
11
Registers, grilles and diffusers for air distribution systems; manual air volume dampers; control grids and baffles for use with registers, grilles and diffusers for air distribution systems; air conditioning and furnace accessories, namely, baseboard and floor registers, side wall registers, ventilating registers, ceiling diffusers, and perimeter diffusers; commercial registers and grilles used in heating and air conditioning systems; dampers, namely, control devices used in air ducts to regulate the flow of air; damper kits comprising damper bearings, counterweights, chain, chain coupling and chain lock; manual damper regulators and regulator sets comprising chain, pulleys, hooks and screws packaged together; ventilation systems comprising gas vent pipes and chimneys
19
Non-metal flexible ducts for use with air distribution systems
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