Fire dampers, namely, control devices used in air ducts to stop the spread of fire; Motorized fire dampers, namely, control devices used in air ducts to stop the spread of fire; Motorized smoke dampers, namely, control devices used in air ducts to stop the spread of smoke; Motorized fire and smoke dampers, namely, control devices used in air ducts to stop the spread of fire and smoke; Air filters for HVAC units; air filters for industrial purposes

'air':8,24,40,58,68,73 'control':4,20,36,54 'damper':2,18,34,52 'devic':5,21,37,55 'duct':9,25,41,59 'filter':69,74 'fire':1,15,17,31,49,65 'hvac':71 'industri':76 'motor':16,32,48 'name':3,19,35,53 'purpos':77 'smoke':33,47,51,67 'spread':13,29,45,63 'stop':11,27,43,61 'unit':72 'use':6,22,38,56

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