Heat recovery ventilators; combination furnace and hot water tank; household air cleaner; heat exchanger not being part of a machine; air conditioners; artificial embers; gas furnaces; combination gas fireplace and furnace appliance comprised of double-walled firebox with flue, ventilation system and air circulation fans, heat exchanger, andirons, artificial logs and artificial embers, and parts and fittings therefor; air and water purifiers

'air':11,21,44,60 'andiron':49 'applianc':32 'artifici':23,50,53 'circul':45 'cleaner':12 'combin':4,27 'compris':33 'condition':22 'doubl':36 'double-wal':35 'ember':24,54 'exchang':14,48 'fan':46 'firebox':38 'fireplac':29 'fit':58 'flue':40 'furnac':5,26,31 'gas':25,28 'heat':1,13,47 'hot':7 'household':10 'log':51 'machin':20 'part':17,56 'purifi':63 'recoveri':2 'system':42 'tank':9 'therefor':59 'ventil':3,41 'wall':37 'water':8,62

NU-AIR

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