Thanks so much for your response. Some more questions:
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Originally Posted by
m0j0
The back of the hush box is sealed in that it sits flush against the back wall. The top of the hush box has two holes toward the back with two exhaust fans, and the exhaust pipes deliver the hot exhaust directly to those fans above to be removed from the hush box.
Where does it exhaust to? The space above the room? How did you determine the size/speed/air flow of the exhaust fan you chose?
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As for intake, there is a hole in the top of the hush box all the way front and center where there is a fan that delivers air from the room directly above the intake fan of the projector.
If the top of the box is against the ceiling, I'm not sure I understand the room air is pulled into the box. But same question as above: How did you determine he size/speed/air flow of the intake fan you chose? Also, I don't see that you have any temperature sensors in the box to determine if the projector is overheating. The inside of the box overheating is one of the things I worry about. Frying my projector due to some intake or exhaust fan failure is not something I want to think about.
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I have the exhaust and intake far enough apart that it seems to work pretty well. I had considered making the exhaust fan come up from below to further separate the hot air and cool air, but ruled it out because I wanted to reduce the noise as much as possible and having a case fan pointing straight at me would probably not have been a good way to reduce the noise, so I went with the intake on top as well.
My situation is a bit different in that the projector takes in air from the rear but exhausts from the front. My plan is to build a "front/back separator" in the box to keep the the exhaust air and intake air as separate as possible