Air purifying apparatus and machines; air purifiers; filters for air conditioning; filters for air purifiers; filter cartridge for air purifiers; air filtering for industrial installations; air filters for domestic use; gas scrubbing apparatus; filters for the purification of flue gases; air sterilizers; air conditioners; air-conditioning, air cooling and ventilation apparatus and instruments; installations and apparatus for heating, cooling, and ventilation purposes, namely, electric fans, a...