Air purifiers, electric air deodorizers, air filtering installations, air sterilizers, germicidal lamps for purifying air, humidifiers, ionization apparatus for the treatment of air, water ionizers for household purposes, and ventilation hoods, and heating, ventilation, and air conditioning (HVAC) units, air conditioning installations, air conditioning apparatus, fans for HVAC units, and ventilating exhaust fans

'air':1,4,6,9,15,23,36,40,43 'apparatus':18,45 'condit':37,41,44 'deodor':5 'electr':3 'exhaust':52 'fan':46,53 'filter':7 'germicid':11 'heat':33 'hood':31 'household':27 'humidifi':16 'hvac':38,48 'instal':8,42 'ioniz':17,25 'lamp':12 'purifi':2,14 'purpos':28 'steril':10 'treatment':21 'unit':39,49 'ventil':30,34,51 'water':24

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