I guess the reason I'm wondering if it's the problem is when you block a fans intake doesn't the fan have to work harder to move the same amount of air? I tried placing a piece of card board behind a box fan and it sounds like the fan slows down/works harder. I heard somewhere that you can burn out a box fan if it tips over and can't get the air flow it needs. Would that not mean that the extra energy needed would be directly transfered to the engine?
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