I have noticed the same thing at speed in our 3901. But I have found that it works fine when the fan is on the fastest 2 speeds. Ours also works at all speeds on recirc. I think it is air pressure in the generator compartment closing the intake door when not on recirculate, but not absolutely positive.
Mike
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Vicki and Mike, Aria 3901- The Wined Up Bus, towing 16 Jeep JKUR.
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