Ventilating Outlets and Grills for the Exhaust and Intake of Air; Heat Exchangers for Transferring Heat from Relatively Hot Air to Relatively Cold Air; Louvers and Ventilating Registers; Air Flow Dampers; Fire Dampers for Ventilating Conduits; Ventilating Conduits; Power-Driven Air Fans; and Combinations Thereof

'air':11,20,24,29,42 'cold':23 'combin':45 'conduit':36,38 'damper':31,33 'driven':41 'exchang':13 'exhaust':7 'fan':43 'fire':32 'flow':30 'grill':4 'heat':12,16 'hot':19 'intak':9 'louver':25 'outlet':2 'power':40 'power-driven':39 'regist':28 'relat':18,22 'thereof':46 'transfer':15 'ventil':1,27,35,37

ALDES

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