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post #1 of 13 Old 04-04-2013, 08:09 PM - Thread Starter
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Working on designing my AV rack for my home theater. Has anyone used a air duck style cooking system? Im planing on using 3 pin fans with 2 thermal controllers, Im wondering if the fans should blow into a ducking system that will exhaust at the top or just leave it open and rely on the fans to exhaust on the top? The whole rack with be custom built out of wood with a glass door on the front.
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post #2 of 13 Old 04-04-2013, 10:17 PM
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Originally Posted by depew23 View Post

Has anyone used a air duck style cooking system?

You mean a rotisserie? wink.gif
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Im planing on using 3 pin fans with 2 thermal controllers, Im wondering if the fans should blow into a ducking system that will exhaust at the top or just leave it open and rely on the fans to exhaust on the top? The whole rack with be custom built out of wood with a glass door on the front.

If you mean ducting inside the rack, routed to outside the rack, then no. Exhaust air from the top of the rack, but you also need to make sure cool air is getting in and moving over the hot components.

Read this white paper before committing to any designs for both the rack and the cooling system:

http://www.middleatlantic.com/pdf/ThermalManagement.pdf


Jeff

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post #3 of 13 Old 04-04-2013, 10:25 PM - Thread Starter
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Thanks great link!! So there is no need for an enclosed route for the hot air exhaust? have you ever heard of that being done? i plan intakes on the bottom exhaust on the top to start a flow and then fans on each level forcing the hot air into the flow. Thanks for the help. ill update with final plans.
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post #4 of 13 Old 04-04-2013, 10:30 PM
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Originally Posted by depew23 View Post

So there is no need for an enclosed route for the hot air exhaust? have you ever heard of that being done?

No, because it won't help, and probably makes things worse.
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i plan intakes on the bottom exhaust on the top to start a flow and then fans on each level forcing the hot air into the flow.

You likely need cool air coming in from the front of the components and/or over the tops of them - if anything, with a glass door, you may need some fans to assist convection across the tops of passively-cooled heat-generating units (amps and AVRs). Otherwise, you don't need to "help" the hot air - it will go to the top all by itself. What you do need is airflow over the components heat sinks to get that heat into the air.


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post #5 of 13 Old 04-04-2013, 10:37 PM - Thread Starter
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blowers on top of the components or fans at the rear of the shelves?
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post #6 of 13 Old 04-05-2013, 12:38 AM
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http://www.middleatlantic.com/rackac/cooling/uqfp.htm

But how much equipment are we talking about?

Rock Creek Theater -- CIH, Panamorph, Martin Logan, SVS PB2000, Carada Masquerade, Grafik Eye, Bar table, Green Glue, JVC RS50 
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post #7 of 13 Old 04-05-2013, 12:54 AM - Thread Starter
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6 racks that are probably high heat and 2 that wont likely heat up e.g. ethernet switch
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post #8 of 13 Old 04-05-2013, 09:29 AM
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Originally Posted by depew23 View Post

6 racks that are probably high heat and 2 that wont likely heat up e.g. ethernet switch

Racks? Plural? I hope you meant 'components'. Even then, are there really six that consume a lot of power? Amplifiers, AVRs and gaming consoles are the usual suspects. Set-top boxes, DVRs need some airflow as they are "always on".

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Theater build photos: http://photobucket.com/autor-ht
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post #9 of 13 Old 04-05-2013, 10:01 AM - Thread Starter
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By racks I meant like levels on components Sorry. yes there are 5-6 depending on the final plan that i feel will need a lot of cooling E.G. AVR, xbox etc. i plan on using glass in the door and having an intake at the bottom. any where else besides the bottom that i can put intake vents, or is the door going to mess that up?
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post #10 of 13 Old 04-05-2013, 12:14 PM
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Originally Posted by depew23 View Post

By racks I meant like levels on components Sorry.

The rest of the world calls those things "shelves". biggrin.gif
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there are 5-6 depending on the final plan that i feel will need a lot of cooling E.G. AVR, xbox etc. i plan on using glass in the door and having an intake at the bottom. any where else besides the bottom that i can put intake vents, or is the door going to mess that up?

Door messes that up. Which is why you don't see most of us using them. That, and they get in the way. Better to skip the door and pull air out the top of the rack/enclosure - and add fans only if there's a problem spot due to close spacing of the shelves... You should probably spend some time looking at the "Show me your RACK" thread for ideas.


Jeff

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post #11 of 13 Old 04-05-2013, 12:27 PM - Thread Starter
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Thanks Noob here haha

So some people just rely on vented shelves and no additional fans?

ive gone through that whole thread already haha
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post #12 of 13 Old 04-05-2013, 12:38 PM
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Quote:
Originally Posted by depew23 View Post

So some people just rely on vented shelves and no additional fans?

Lots of people do. It depends on the heat load and how enclosed the rack / stack is. On my theater rack I have vented faceplates and an HVAC return fan at the top of the rack to exhaust the whole thing. My equipment closet rack is completely open, and is vented the same way.

Post a diagram or picture of what you're building and folks can give you more specific advice. Otherwise, read the MA white paper and follow that.

Jeff

Rock Creek Theater -- CIH, Panamorph, Martin Logan, SVS PB2000, Carada Masquerade, Grafik Eye, Bar table, Green Glue, JVC RS50 
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post #13 of 13 Old 04-05-2013, 12:50 PM - Thread Starter
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Thanks for all the help. Ill post when the plans are finalized.biggrin.gif
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