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The propeller is a special Ductaxial solid aluminum casting, direct connected to an industrial duty,totally enclosed motor. The burner is the product of many years of experience in the crop drying fieldwithdirect-firedburners. Products of combustion, which are discharged directly into the main airstream, consist of carbon dioxide and water vapor. At maximum rated heat output the concentration Of C02 is approximately 2000 PPM (parts per million) compared with a maximum allowable* of 5000 PPM. Alt