Metal and magnetic frames for vent covers for HVAC ducts; metal and magnetic frames for access panels for walls, ceilings and exhaust fans; vent covers of metal; clips of metal for air filters.

'access':16 'air':32 'ceil':20 'clip':28 'cover':7,25 'duct':10 'exhaust':22 'fan':23 'filter':33 'frame':4,14 'hvac':9 'magnet':3,13 'metal':1,11,27,30 'panel':17 'vent':6,24 'wall':19

non-metal vent covers for HVAC ducts; non-metal access panels for walls and ceilings; non-metal cold air returns for furnaces and air supplies for air conditioners; vent covers, not of metal

'access':12 'air':22,27,30 'ceil':17 'cold':21 'condition':31 'cover':5,33 'duct':8 'furnac':25 'hvac':7 'metal':3,11,20,36 'non':2,10,19 'non-met':1,9,18 'panel':13 'return':23 'suppli':28 'vent':4,32 'wall':15

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