Heat exchangers not being machine parts; air filtering installations and air cooling apparatus, namely, moisture exchangers and ventilating apparatus and equipment in the nature of multicellular plastic blocks used as inserts for air filtering and air cooling apparatus in buildings using natural ventilation; heat exchange elements and inserts for water cooling towers, splash deflectors for cooling towers, inserts for filtering air and water, gas scrubbers, humidifiers for conditioning air and gases, cooling evaporators

Plastics in extruded form for use in manufacture; plastic parts for waste water clarifying installations, drinking water treatment installations, refrigerating apparatus and installations and cooling towers, storage and seepage installations for rainwater or waste water, namely, synthetic plastic filling materials in foil form; synthetic plastic filling material in foil form for filters used in aquaculture, for mass transfer and mass transfer columns, and for air and exhaust gas purification

[ Non-metallic building materials, namely, plastic webbing material used to reinforce bituminous waterproofing sheets, plastic pipe supports, cellular PVC and PP trim, composite panels composed primarily of non-metal materials, concrete-based slabs, cementitious material for building purposes, reinforcing materials not of metal for building purposes; non-metallic rigid pipes for building; asphalt, pitch and bitumen; non-metallic transportable buildings; monuments, not of metal, namely, stone monuments ]