Air filters and air purifying units for ventilation systems, air conditioning units, heaters, coolers, humidifiers, dryers, various environment control systems of commercial, domestic and industrial use; air filters and air purifying units for heaters and air conditioners for vehicles; cabin air filters for vehicles; air separators for the cleaning and purification of air of dust, toxic gases, unneeded particles, vapors, odors, pollutants or other impurities.