ventilation system components, namely, an arrangement of fixed vanes mounted in a sheet metal housing for use in the return air duct of a commercial air handling system to blend return air with outside air in order to prevent air temperature stratification

'air':21,26,32,35,40 'arrang':6 'blend':30 'commerci':25 'compon':3 'duct':22 'fix':8 'handl':27 'hous':15 'metal':14 'mount':10 'name':4 'order':37 'outsid':34 'prevent':39 'return':20,31 'sheet':13 'stratif':42 'system':2,28 'temperatur':41 'use':17 'vane':9 'ventil':1

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