Heating, ventilation and air conditioning systems; Heating, cooling and ventilation apparatus and instruments; Air filtration systems composed primarily of air filtering units; Air purification systems composed primarily air cleaning units containing an air filter, ultraviolet lights and a photocatalytic filter

'air':4,14,20,23,28,33 'apparatus':11 'clean':29 'compos':17,26 'condit':5 'contain':31 'cool':8 'filter':21,34,40 'filtrat':15 'heat':1,7 'instrument':13 'light':36 'photocatalyt':39 'primarili':18,27 'purif':24 'system':6,16,25 'ultraviolet':35 'unit':22,30 'ventil':2,10

Metal covers for HVAC systems, namely, metal covers for HVAC ducts

'cover':2,8 'duct':11 'hvac':4,10 'metal':1,7 'name':6 'system':5

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