19 Vent covers made of plastic; vent covers of plastic for HVAC ducts; air flow adjustment registers made of plastic; vent covers made of vinyl; vent covers of vinyl for HVAC ducts; air flow adjustment registers made of vinyl; plastic door panels; vinyl door panels; cold air return vents made of plastic; cold air return vents made of vinyl; vent covers made of tile, marble, natural stone, hardwood, and wood-plastic composite; vent covers of tile, marble, natural stone, hardwood, and engineered flooring for HVAC ducts; air flow adjustment registers made of tile, marble, natural stone, hardwood, and wood-plastic composite; door panels made of tile, marble, natural stone, hardwood, and engineered flooring; cold air returns made of tile, marble, natural stone, hardwood, and wood plastic composite