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AVPartner.com Tip: A dirty projector filter will cause it to run hotter and might cause the projector bulb to burn out prematurely. Therefore, we recommend cleaning the projector filter once a quarter with a can of compressed air. If your environment is smoke-filled or dusty, you may need to clean the projector filter monthly. The result of cleaning your projector filter regularly may result in additional months of use from your same projector bulb.