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04-12-2013, 10:47 PM   #1
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## Proper CFM for a dedicated room

As far as CFM's required. I understand that it's the cf. of the room times a minimum of 4 divided by 60 for the formula.

My room is 1206 cf. so according to the formula;
air circulated 4x per hour = 80 CFM
air circulated 6x per hour = 120 CFM

All of the equipment will be in the room and it will hold up to 6 people. Does heat produced hold any relevance when calculating proper CFM for an enclosed HT? How many CFM's should I shoot for?

At the very most, the room fully occupied will be producing 9170 btu's or heat.

Was considering this fan...too powerful? not powerful enough?

http://www2.panasonic.com/webapp/wcs...1&displayTab=O

Thank you.

04-13-2013, 01:32 AM   #2

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Its not the cubic foot of a room that determines how much air it needs. Its the heat produced in the room, how much heat the room gains, and the temp of the air that is being put into the room that determines CFM.

So you have 6470 BTUs from equipment, and 2700 BTUs from people. What about heat gain through the walls.

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 The Following User Says Thank You to beenthere For This Useful Post: ben's plumbing (04-13-2013)
 04-14-2013, 02:40 PM #3 Member   Join Date: Nov 2012 Location: Toledo, OH Posts: 205 Rewards Points: 150 Not much heat gain through the walls at all as it's 100% insulated and the room is surrounded by exterior foundation walls and an unfinished portion of the basement. What would be the proper CFM and amount of air exchanges per hour require for this room.
 04-14-2013, 03:03 PM #4 An old Tradesmen   Join Date: Oct 2008 Location: Somewhere Posts: 33,584 Rewards Points: 6,132 From an A/C with a 20 degree cooler air temp enteing the room then the room is, about 300 CFM. __________________ When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
 04-14-2013, 03:09 PM #5 Member   Join Date: Nov 2012 Location: Toledo, OH Posts: 205 Rewards Points: 150 Oh wow. Is that even possible with a 6" flex duct? Would it cause a "wooshing" noise at the vent?
 04-14-2013, 03:56 PM #6 An old Tradesmen   Join Date: Oct 2008 Location: Somewhere Posts: 33,584 Rewards Points: 6,132 It would take 4-6" flex ducts. You have a 3/4 ton cooling load. __________________ When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
 04-14-2013, 04:12 PM #7 Member   Join Date: Nov 2012 Location: Toledo, OH Posts: 205 Rewards Points: 150 I'm sorry did you mean four 6" flex ducts? I plan on building 2 dead vents(1 for supply and 1 for return) for the room so as to isolate the theater vents from the rest of the duct work for sound isolation purposes. Here is what it looks like: Attached Thumbnails
 04-14-2013, 04:18 PM #8 An old Tradesmen   Join Date: Oct 2008 Location: Somewhere Posts: 33,584 Rewards Points: 6,132 Yes, four 6". Or you can use a 1-10". You would be better off just installing a ductless mini split. using ir for another room to cool the theater room, won't get you humidity control. So it won't be comfortable. __________________ When posting in certain forums, knowing your location will help others give better feedback/advice/solutions to your questions.
 04-14-2013, 04:31 PM #9 Member   Join Date: Nov 2012 Location: Toledo, OH Posts: 205 Rewards Points: 150 Well I've been told to use the fan I linked in the return and supply dead vent and just have them both run at the same time the whole time i'm down there. Would that work or still no. The adjacent room in the basement has 3 supplies and 1 return already from the main furnace and a dehumidifier. What do you mean IR from another room? Infrared signal?
04-14-2013, 06:14 PM   #10

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LOL. "ir" was suppose to be "air".

The person who told you to just use that fan set up. How well does it work in their theater room.

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 Tags air , btu , cfm , fan , vent

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