Blowers for ventilation or cooling purposes, namely, low pressure blowers, medium pressure blowers, high pressure blowers; conveying blowers for dust removal or transport of particular material from ventilation or cooling units; side channel blowers for use with ventilation or cooling units for generating overpressure or underpressure; accessories for all the preceding goods, namely, filters, valves, pipes/tubing, fan wheels, electric control units sold as a unit therewith; air conditioning a...