dampers, namely, fire dampers, radiation dampers, smoke dampers, combination smoke damper and control damper, and ventilating louvers; and parts therefor for dampers, louvers, roof exhaust fans, roof supply fans, sidewall propeller fans, inline fans and other fans for commercial, industrial and institutional use

'combin':9 'commerci':39 'control':13 'damper':1,4,6,8,11,14,22 'exhaust':25 'fan':26,29,32,34,37 'fire':3 'industri':40 'inlin':33 'institut':42 'louver':17,23 'name':2 'part':19 'propel':31 'radiat':5 'roof':24,27 'sidewal':30 'smoke':7,10 'suppli':28 'therefor':20 'use':43 'ventil':16

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