My room was fairly dusty and I didn't clean the filter until a little before 250 hours. Used a 2hp shop vac (made sure to hold the filter in place tightly ) and honestly didn't notice much of a difference. It might have helped that the AE100 was up quite high.
I've got an NEC LT 150 and i clean the dust out of it whenever I change the lamp. (I'm on lamp 3 now.) I wonder if my hushbox could be helping keep it clean, it's never dirty inside like my PC's. Those those suckers get really dirty.
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