Hush box construction, day 2:
1. The box will have two levels
2. First level has air intakes and exhaust, approximately 25” separated
3. Fins may assist in directing exhaust from intake
4. Two 80mm fans each will control intake and exhaust. I chose these as they require less depth than 120mm fans.
5. The fans will be in a channel such that the cross section of the intake INCREASES as air gets closer to the fans and the projector, in efforts to avoid amplifying the sound (kinda like a reverse horn).
6. My Epson 5050 will get most air directed to/away it’s front fan ports, though there is enough space for some air to freely flow around the pj.
7. Some form of temperature control with a a display and manual override. Possibly a heat controlled failsafe cut off for the pj.
8. Linacoustic around the main channel.
9. Dust filters.
10. All of this will be removable from the existing crawl space entrance.
11. I have opted to have intake and exhaust in the theater and not the crawl space given possible temperature extremes in the crawlspace.
12. I considered exhausting into the crawlspace, but the airtight nature of the room and aforementioned temp extremes of the crawlspace dissuaded me from this.
13. Yes, I have read about various regrets in using hushboxes!
Current pre-made implementations for fan controls are meh. I am considering a home-brew Arduino to ensure at least some air flow, with a demand driven increase in flow. I understand that over-ventilating can be a problem.
Below is the lower level air channel design process.