IC 011. US 013 021 023 031 034. G & S: Air ventilation systems including for buildings, underground car parks, or tunnels composed of air conditioning, air cooling and ventilation apparatus and instruments; air ventilation system extractor fans; air ventilation system exhaust fans; air ventilation system silencers; structural parts and fittings therefor including air ventilation system connectors, air ventilation system mounting brackets, and air ventilation system connecting brackets; air ventilation systems for vehicles, ships, or aircraft composed of air conditioning, air cooling and ventilation apparatus and instruments; air exhaust systems for vehicles, ships, or aircraft composed of air conditioning, air cooling and ventilation apparatus and instruments; structural parts and fittings therefor

IC 019. US 001 012 033 050. G & S: Non-metallic rigid air ventilation ducts; non-metallic rigid ventilation channels for use as ducts; non-metallic flexible air ventilation ducts; non-metallic flexible ventilation channels for use as ducts; structural parts and fittings therefor