Apparatus for controlling the atmosphere in kilns for drying lumber and other wood products, namely, a unit for mounting on a [ kin ] * KILN *, the unit housing intake and exhaust fans, dampers for controlling air flow to and from the kiln, and a heat exchanger for recovering heat from hot moisture-laden air exiting the kiln and for preheating cool make-up air entering the kiln

'air':34,53,64 'apparatus':1 'atmospher':5 'control':3,33 'cool':60 'damper':31 'dri':9 'enter':65 'exchang':44 'exhaust':29 'exit':54 'fan':30 'flow':35 'heat':43,47 'hot':49 'hous':26 'intak':27 'kiln':7,23,40,56,67 'kin':22 'laden':52 'lumber':10 'make':62 'make-up':61 'moistur':51 'moisture-laden':50 'mount':19 'name':15 'preheat':59 'product':14 'recov':46 'unit':17,25 'wood':13

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