11 Sanitary apparatus and installations, namely, air conditioning and air purifying units; clean chambers in the nature of sanitary installations; air purifying apparatus and machines; air-conditioning apparatus; air-conditioning installations; ventilation apparatus, namely, air conditioning and air purifying units; air filters for air conditioning units, industrial installations, and air purifying units; air sterilizers; humidifiers; air reheaters; air handling installations in the nature of HVAC units; electrostatic air filters for industrial use, air conditioners, and air purifying units; industrial air purifiers; air separation apparatus being separators for purifying air; air purifying apparatus; air filtering installations; air circulation apparatus, namely, air conditioners, and air purifying units; air treatment equipment, namely, air sterilizers, air conditioners, air purifiers, air filtering apparatus, ionization apparatus for the treatment of air; air conditioning apparatus for industrial use; air cleaning filters being parts of air cleaning machines or installations; filters for air conditioning; smoke purifiers, namely, separators for the purification of air containing smoke; ventilation apparatus, namely, HVAC units; aeration apparatus, namely, ventilation grilles and air filtering installations