design of energy recovery systems comprising air-to-air energy exchangers and environmental acoustic products, namely, duct elements for use in air distribution systems and air-conditioning systems which attenuate noise generated by air flowing through such systems, for others

'acoust':15 'air':8,10,23,28,36 'air-condit':27 'air-to-air':7 'attenu':32 'compris':6 'condit':29 'design':1 'distribut':24 'duct':18 'element':19 'energi':3,11 'environment':14 'exchang':12 'flow':37 'generat':34 'name':17 'nois':33 'other':42 'product':16 'recoveri':4 'system':5,25,30,40 'use':21

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