11
air cooling apparatus; Cooling appliances and installations; Heat exchangers, other than parts of machines; Heating apparatus; Heating installations; Heating plates; Ventilation [air-conditioning] installations and apparatus; Air cleaning apparatus; Air purification installations; Floor heating apparatus
17
fittings, not of metal, for compressed air lines; Fittings, not of metal, for flexible pipes; Fittings, not of metal, for rigid pipes; Soundproofing materials; Sound absorbing flooring underlayment; Non-metallic flexible pipes
19
building panels, not of metal; Floors, not of metal; Rigid pipes, not of metal, for building; Air ducts of non-metallic materials for buildings; Ducts, not of metal, for ventilating and air-conditioning installations; Non-metallic air ducts for buildings; Non-metal vent covers for HVAC ducts; Non-metal floor panels
37
building insulating; Heating equipment installation and repair