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We have a 915 combine we use to harvest wheat with. We disabled the chopper and spreader so that it lays the straw in a windrow ready to square bale. But we’re having problems with the fan not blowing the chaff out very good. I’ve tried adjusting the fan belt but it doesn’t seem to make much difference. I think it’s a poorly designed fan system and should have a fan blowing straight in from the bottom. This system has a fan pulling air from the side and blowing down and then back up through the ductwork. We’ve been thinking about redoing some of the ductwork and using a high speed 12 volt fan mounted closer to he bottom of the machine tp really push air through and hopefully get most of the chaff out. Has anybody done this or anything similar? We only do about 30 acres of wheat per year. The machine is in good shape otherwise so I hate to spend the money getting another combine. We have a 1640 for corn. We tried it on wheat but it absolutely destroyed the straw. I’m just curious if it’s possible to get a dc powered fan to blow that much air for the amount of time.