Ventilation (air-conditioning) installations for vehicles, ventilation (air-conditioning) installations and apparatus, air cleaning units, air cleaning units containing an air filter, air conditioning units for mining vehicles, air exchangers for cleaning and purifying air, air filtering installations, air filters for air conditioners in vehicle passenger compartments, air filters for air conditioning units, air purifying units for use in the mining industry, air purifying apparatus and machines, filters for air conditioning, air conditioning installations for vehicles, in particular conditioning air quality and air pressure