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I want to pull air through a vent in a box and into a filter. I want to be able to turn on the lights in the room anytime I want and know that I'm not disturbing the light cycle in the box. I want the vent to let no light in and let air in.
I tried that by constructing something like a periscope without mirrors. While greatly reducing the light from a flashlight, 2, 90 degree turns didn't eliminate all light. Think I'll add another turn and try again.