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Discussion Starter #1
Hi Guys,

In my home theater that's underway, I was planning to do a flush mount equipment rack similar to what member "YW84U" did, with the equipment housed in its own room off to the side.

The volume of this equipment "closet" is approximately 79 cubic feet.

What do you recommend for a ventilation fan? I'm thinking I should definitely provide something so I can prevent that interior space behind the equipment from getting too hot.

I'm not completely sure on the exhaust routing but I think I can send the fan outlet out above the adjacent bedroom's closet and out to an exterior foundation wall of the house.

I'm not even sure how I should spec a fan for such a small room. Only that I should probably get one that is quiet.

Any ideas would be appreciated. Thanks.
 

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FAN

I use a 10" exhaust fan in the top of my equipment racks. The fans use induction motors, the manufacturer is Papst.

tim
 

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Discussion Starter #3
How did you go about sizing it?

I just did the rule of thumb calc which takes floor area x 1.1 (for 8ft ceiling) to determine CFMs.

Based on my equipment room size, which has a floor area of 4.125 ft x 3.08 ft, that works out to ~14 CFMs. (Based on 8 air changes per hour, which is at least the ventilation requirement for bathrooms).

However, the ceiling height in this equipment room is less, closer to 6ft. (6.25 ft). So even 14 CFMs might be too high, depending on what the criteria should be.

If the numbers above are anything to go by, the required fan might be quite small.
 

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Discussion Starter #4
I'm thinking I need a different criteria. 8 air changes per hour is probably based on moisture control for a bathroom and has nothing to do with heat removal.
 

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I placed all of my gear in a small closet that I vented into deadspace between the cieling and floor.

Since I didn't need to duct the exhaust (which might be similar to your situation), I went with these simple products.

A 12v DC Power Supply (e.g., http://www.coolerguys.com/840556029977.html)
A thermal controller (http://www.coolerguys.com/840556086611.html)

I then had the flexibility to use any 12V fan.

I ended up going with the largest diameter (200mm) and slowest speed fan I could find since I wanted to keep the noise to near zero. (like this one: http://www.memoryexpress.com/Products/PID-MX27121(ME).aspx)

Since I can run two fans, I hooked up a second smaller fan as cold air intake at the bottom of the closet that pulls air from some dead space near the floor of the closet.
 
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