11 hot air tunnel for drying leather, imitation leather, animal skins, regenerated animal skins, textile products, synthetic materials, paper, cardboard, rubber, plastics and flat glass; heated drying tunnels for leather, imitation leather, animal skins, regenerated animal skins, textile products, synthetic materials, paper, cardboard, rubber, plastics and flat glass; ovens, namely dyathermic oil ovens, gas ovens, hot water ovens, superheated water ovens, steam ovens, infrared ovens, electrical resistance ovens; drying ovens for industrial use; blast chillers for use with skins, artificial skins, leather, regenerated leather, textiles and textile articles, synthetic materials, paper, cardboard, rubbers, plastics and flat glass; gas, aerosol, vernished overspray and pollution scrubbing installations; cooling systems; cooling unit for industrial purposes; industrial air filtration systems; air intake systems being air filtering installations; electric surface heating tapes