Ventilation for a small HT room. Please help this fool. - AVS Forum | Home Theater Discussions And Reviews
Forum Jump: 
 6Likes
  • 1 Post By impreza276
  • 1 Post By BIGmouthinDC
  • 1 Post By BIGmouthinDC
  • 1 Post By bluer101
  • 2 Post By bluer101
 
Thread Tools
post #1 of 22 Old 05-24-2019, 06:14 AM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
Ventilation for a small HT room. Please help this fool.

Long story short, had my spare bedroom converted to a small dedicated theater late last year and arguably didn't do my homework on everything I should have.

What do I mean? Is it stuffy in here? Oh yeah, ventilation.... Or lack thre of. The room is a 10x13x8, on the second floor, ceiling goes to the attic and two exterior walls (front/right) and other 2 walls go into the interior hallway. The problem is there is only one forced air vent and no return; which means by the middle of a 2 hour movie you're less than comfortable. This is becoming especially apparent in the winter when the vent is essentially closed off because its pimping heat (I manually turn off the heater before we watch a movie).

After doing some research, which I should have done laet year, it appears many opt for a mini-split as the solution. At this point in time, I'm trying to avoid that route...at least right now.

What are my other options, if any?

My thoughts at a somewhat of cursory glance:
1. At the very least, a passive return in a form of cutting a hole in a wall that dumps into the rest of the house and add a grill. This is fine in the summer as the forced air is getting dumped into the room from Central HVAC.

2. Add an auxiliary 6" or 8" line to the room with an inline fan that in the winter can suck cold air in from the attic (add a filter). Maybe add a split with a dampner and have a another fan to actively suck air out of the room in the summer (dump it in the rest of the house as a return or dump in the attic)?

What do you guys suggest? Is there really a good (enough) solution without going the mini-split route? Thoughts?

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
Sponsored Links
Advertisement
 
post #2 of 22 Old 05-24-2019, 06:35 AM
AVS Forum Special Member
 
impreza276's Avatar
 
Join Date: Sep 2006
Posts: 1,237
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 482 Post(s)
Liked: 720
Crack the door open and use a portable fan to push air into the room. If it cures the problem then all you need is fresh air supply.
impreza276 is online now  
post #3 of 22 Old 05-24-2019, 06:37 AM
AVS Forum Special Member
 
markmon1's Avatar
 
Join Date: Dec 2006
Posts: 5,522
Mentioned: 102 Post(s)
Tagged: 0 Thread(s)
Quoted: 4652 Post(s)
Liked: 2946
You need an air conditioner. If not a mini-split then some other type (portable, in wall etc). My friend got a self-install minisplit and it works great. I think it was around $1100 total for his 16x21x10 room.

Video: JVC RS4500 135" screen in pure black room no light, htpc nvidia 1080ti.
Audio: Anthem mrx720 running 7.1.4, McIntosh MC-303, MC-152, B&W 802d3 LR, B&W HTM1D3 center, B&W 805d3 surround, B&W 702S2 rear, B&W 706s2 x 4 shelf mounted for atmos, 2 sub arrays both infinite baffle: 4x15 fi audio running on behringer ep4000 + 4x12 fi audio running on 2nd ep4000.
markmon1 is online now  
Sponsored Links
Advertisement
 
post #4 of 22 Old 05-24-2019, 08:46 AM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
So would using inline fans (in the attic) to move fresh air in, draw hot/stale air out into/from the rest of the house not a viable solution?

The house is typically coled to 73/74 heated to 68F.

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
post #5 of 22 Old 05-24-2019, 09:19 AM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 31,630
Mentioned: 414 Post(s)
Tagged: 5 Thread(s)
Quoted: 5549 Post(s)
Liked: 5140
What you are proposing is an air exchange system to satisfy the HVAC needs of your theater. You basically want to use the reservoir of conditioned air outside the theater to make it comfortable. A more elegant method but similar to opening the door and positioning a fan. It can work but here are the things that you need to consider. Sound leakage in and out of the theater space, if a concern you need to use a sound attenuation duct design. Often referred to in this forum as a dead vent. Fan motor/vibration noise, something you want to minimze by keeping the fans as far from the theater space as possible. Air turbulence noise, the magic number is the air speed at the face of any vent (supply and return) should be less than 250 ft per minute. Effective use of the reservoir, keep the intake and exhaust far from each other to get good mixing. Other wise you will just heat a small section of your house with theater air.

Then obviously you need to size the system so that you achieve your goals, Air dumping out of AC vent may be 10-14 degrees cooler than the room, but air coming in from an adjacent room will be far less. So you will need more air to achieve the same comfort level.

One major advantage of an air exchange system is that you are mixing in some fresh air all the time, a problem with small sealed rooms is the build up of CO2, What is the typical occupancy? there are some formulas I've seen where you can calculate at what point the room will seem stuffy and you start getting headaches. Most mini-splits hanging on the wall just cool the same stale air unless you plan a fresh air supply.

Bottom line is it can and has been done, you just need to plan it out.

Last edited by BIGmouthinDC; 05-24-2019 at 09:22 AM.
BIGmouthinDC is offline  
post #6 of 22 Old 05-24-2019, 09:37 AM
AVS Forum Special Member
 
impreza276's Avatar
 
Join Date: Sep 2006
Posts: 1,237
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 482 Post(s)
Liked: 720
There some questions I have about the room:

- Is the room tightly sealed that there is no exchange of air when the HVAC is running in summer?

- Is the room stuffy in the summer when the vent is open?

- Does the room get hot in the winter, or just stuffy?

- Have you tried cracking the door open when the HVAC is running so that air can exit out the door, acting as a return path?

As suggested, run the fan though cracked door test to see if air exchange is the only problem.
impreza276 is online now  
post #7 of 22 Old 05-24-2019, 10:08 AM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
Quote:
Originally Posted by BIGmouthinDC View Post
One major advantage of an air exchange system is that you are mixing in some fresh air all the time, a problem with small sealed rooms is the build up of CO2, What is the typical occupancy?
Thanks for the reply and giving me some hope here. As for your question of occupancy, 99% of the time it's just my wife and I. Occasionally we have another couple over.

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
post #8 of 22 Old 05-24-2019, 10:14 AM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
Quote:
Originally Posted by impreza276 View Post
There some questions I have about the room:

- Is the room tightly sealed that there is no exchange of air when the HVAC is running in summer?

- Is the room stuffy in the summer when the vent is open?

- Does the room get hot in the winter, or just stuffy?

- Have you tried cracking the door open when the HVAC is running so that air can exit out the door, acting as a return path?

As suggested, run the fan though cracked door test to see if air exchange is the only problem.

1. Room is "sealed" other than what escapes under the door (1/4" gap) and out of the old window.

2. In the summer with the AC dumping cold air it's actually fairly comfortable, sometimes wide even complains it gets chilly... But once the AC is off, it gets warm fairly quick. (PJ, people, AV equipment heat).

3. In the winter when I close of the vent, it starts out chilly/cool and goes to comfortable to on the warm side as the movie watching goes on.

4. I've tried leaving the door cracked which seemed to help with circulation but didn't seem to do much for temp. Plus due to the door placement leaving it open also gets in the way of rear speaker if opened past certain point.
Attached Thumbnails
Click image for larger version

Name:	Room 2.0.1.png
Views:	21
Size:	280.3 KB
ID:	2571130  

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
post #9 of 22 Old 05-24-2019, 10:37 AM
Advanced Member
 
usc1995's Avatar
 
Join Date: Jan 2007
Location: Sunny Southern California
Posts: 722
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Liked: 246
I use a mini split in my 15 X 10.5 X 7.5 ft room and it's awesome. My room only had one small vent connected to our central air when I built it and it was never enough to keep the room cool during the summer. The mini split cools it very quick and very comfortable. The advantage to the mini split in the winter is that you will not be turning on your central ac when you want to watch a movie but you can still keep the room cool despite how many people you cram in there. I have not found stale air to be an issue as I usually get up for snacks or to use the restroom at some point and it lets in plenty of fresh air. I got a great deal from a seller I found on Craigslist and depending on where you are located you may be able to get one too. I posted about my experience here https://www.avsforum.com/forum/19-de...ditioners.html Good luck with whatever you decide to do!
usc1995 is offline  
post #10 of 22 Old 05-24-2019, 11:33 AM
AVS Forum Special Member
 
impreza276's Avatar
 
Join Date: Sep 2006
Posts: 1,237
Mentioned: 16 Post(s)
Tagged: 0 Thread(s)
Quoted: 482 Post(s)
Liked: 720
Quote:
Originally Posted by Shape of Grey View Post
1. Room is "sealed" other than what escapes under the door (1/4" gap) and out of the old window.

2. In the summer with the AC dumping cold air it's actually fairly comfortable, sometimes wide even complains it gets chilly... But once the AC is off, it gets warm fairly quick. (PJ, people, AV equipment heat).

3. In the winter when I close of the vent, it starts out chilly/cool and goes to comfortable to on the warm side as the movie watching goes on.

4. I've tried leaving the door cracked which seemed to help with circulation but didn't seem to do much for temp. Plus due to the door placement leaving it open also gets in the way of rear speaker if opened past certain point.
In that case I would recommend a robust air exchange system with the hallway, as Big suggested. Install that and hold off on a mini split until you see how the air exchange works out. Six inch ducts and fans should be fine. https://www.soundproofingcompany.com.../the-dead-vent
Shape of Grey likes this.
impreza276 is online now  
post #11 of 22 Old 05-24-2019, 01:03 PM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 31,630
Mentioned: 414 Post(s)
Tagged: 5 Thread(s)
Quoted: 5549 Post(s)
Liked: 5140
some guidelines related to CO2 build up in the room, One person produces 1.7 cu ft of CO2 and hour. Your room is 1040 cu ft.


Timeline based on 1 person in a 1000 cu ft room. Copied from an online article

30 mins .1 % CO2 Slight Headache

6 Hours 1 % Slight increase in respiratory rate, hardly noticeable; feeling hot and clammy, inability to concentrate, fatigue, anxiety, clumsiness and loss of energy, inability to control limbs reliably (“jelly knees”).

12 Hours 2 % Breathing rate will be 50% faster, headache after a few hours at this level, tiredness.

18 Hours 3 % Breathing rate doubles, panting, dizziness, severe headache, vision disturbances (sparks, stars, speckles), reduction in night-vision, blood pressure increase, may affect hearing; Prolonged exposure to this concentration may cause extreme sluggishness but usually not death

24 Hours 4-5% Immediately dangerous. Breathing 4x normal rate, feeling unable to catch breath, severe headache, choking feeling and unconsciousness within 30 minutes. May cause permanent side effects. Prolonged exposure can cause death.

30 Hours > 5% Extreme rapid breathing, choking sensation, tinnitus, impaired vision, confusion; At 10%, unconsciousness and death within a few minutes.
Shape of Grey likes this.
BIGmouthinDC is offline  
post #12 of 22 Old 05-24-2019, 03:57 PM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
Would you guys suggest or suggest against pulling the air out of the room and dumping it into the attic (vs returning the HT air into the rest of the house)? Then draw fresh air from the conditioned interior of the house?

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
post #13 of 22 Old 05-24-2019, 04:44 PM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 31,630
Mentioned: 414 Post(s)
Tagged: 5 Thread(s)
Quoted: 5549 Post(s)
Liked: 5140
what climate is this? It is generally not a good idea and may be a code violation to dump air into the attic. You can take it out through the roof or out the side of the house like a bathroom exhaust or kitchen range hood. Anytime you suck air out of a house you need to think about where the replacement will come from.
impreza276 likes this.
BIGmouthinDC is offline  
post #14 of 22 Old 05-24-2019, 05:09 PM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
Quote:
Originally Posted by BIGmouthinDC View Post
what climate is this? It is generally not a good idea and may be a code violation to dump air into the attic. You can take it out through the roof or out the side of the house like a bathroom exhaust or kitchen range hood. Anytime you suck air out of a house you need to think about where the replacement will come from.
This is in central VA. But now the more I think about it, the more I'm thinking against it.

Thinking this will end up being 2x6 or 8" fans. One for intake one for exhaust. Each with its own individual duct.

As far as placement locations, I'm guessing far/opposite locations from each other? Thinking about putting the exhausts duct near the PJ location so that it would suck away that PJ exhaust air.

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
post #15 of 22 Old 05-24-2019, 05:19 PM
HOME THEATER CONTRACTOR
 
BIGmouthinDC's Avatar
 
Join Date: Jan 2003
Location: Northern VA
Posts: 31,630
Mentioned: 414 Post(s)
Tagged: 5 Thread(s)
Quoted: 5549 Post(s)
Liked: 5140
where you put them outside the theater is a critical element. If they are too close together they will create a short circuit loop and you will just heat up the space between them with the theater air.
BIGmouthinDC is offline  
post #16 of 22 Old 05-24-2019, 05:34 PM
Advanced Member
 
Join Date: Jul 2017
Location: Out West
Posts: 851
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 494 Post(s)
Liked: 278
You could purchase a stand alone dual mode heat pump that would have a couple of hoses that go into a window:

https://www.homedepot.com/p/Whynter-...2SDH/202555718
DunMunro is offline  
post #17 of 22 Old 05-24-2019, 07:24 PM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
Quote:
Originally Posted by BIGmouthinDC View Post
where you put them outside the theater is a critical element. If they are too close together they will create a short circuit loop and you will just heat up the space between them with the theater air.
I'd have to do some planning when I get home. What might have to happen is exhaust will dump into one of the other rooms and intake will be 2nd floor hallway; or vice versa. Otherwise hallways is too small to have both exhaust and intake.

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
post #18 of 22 Old 05-24-2019, 09:47 PM
Advanced Member
 
usc1995's Avatar
 
Join Date: Jan 2007
Location: Sunny Southern California
Posts: 722
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 377 Post(s)
Liked: 246
Quote:
Originally Posted by DunMunro View Post
You could purchase a stand alone dual mode heat pump that would have a couple of hoses that go into a window:



https://www.homedepot.com/p/Whynter-...2SDH/202555718


I used to run a portable ac in my room but the noise from it was so distracting I gave up. Maybe the one you linked is quieter but the one I had was useless in a small theater room.


Sent from my iPad using Tapatalk
usc1995 is offline  
post #19 of 22 Old 05-24-2019, 11:03 PM
Member
 
slash007's Avatar
 
Join Date: Aug 2004
Posts: 95
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Liked: 10
I was searching and found this thread and am trying to avoid the same issue. I can make another thread if necessary. My theater room is 16*22 and will have all soundproofing techniques applied. (clips, channel, etc.). Nothing penetrating walls as all electric running through soffits and columns etc. I have been going back and forth with the HVAC tech regarding options and he is hesitant to zone the system so because of the main unit output being too much for this size room and not finding a way to dump off enough of the BTU's. Strongly suggesting a separate unit. Of course that greatly increases the cost and I am trying to figure out if there is any way at all to avoid using another system. Any thoughts are appreciated. Let me know if more information is needed as well.


I want to add that local theater guru thinks that a dead vent setup would work, HVAC guy isn't buying it.
slash007 is offline  
post #20 of 22 Old 05-26-2019, 01:52 PM
AVS Forum Special Member
 
bluer101's Avatar
 
Join Date: Mar 2005
Location: South Florida
Posts: 2,384
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 624 Post(s)
Liked: 704
My dedicated room is 14 x 9 x 8. I have the one ac vent into the room but also did an air exchange system. This was the best decision I made and glad I added it. It exchanges with the hallway just outside the theater through my rack. The hot air return also picks up the projector exhaust too. So the only heat in the room is from people but that’s not an issue with the exchange.

Here is some on my build with the intake.

https://www.avsforum.com/forum/19-de...l#post56564274
Shape of Grey likes this.
bluer101 is offline  
post #21 of 22 Old 05-26-2019, 03:23 PM - Thread Starter
Member
 
Shape of Grey's Avatar
 
Join Date: Feb 2009
Posts: 169
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Liked: 52
Quote:
Originally Posted by bluer101 View Post
My dedicated room is 14 x 9 x 8. I have the one ac vent into the room but also did an air exchange system. This was the best decision I made and glad I added it. It exchanges with the hallway just outside the theater through my rack. The hot air return also picks up the projector exhaust too. So the only heat in the room is from people but that’s not an issue with the exchange.

Here is some on my build with the intake.

https://www.avsforum.com/forum/19-de...l#post56564274
I've gone through your build, beautiful BTW, but had a question. Do you also have an intake line dumping conditioned house air or just exhausting the "hot" air and let the home HVAC do the rest?

Living Room-Sony 65" XBR900E, Denon X3300W, Nvidia SHIELD. 5.1.2-Ascend Acoustics CBM-170SE L/R, CMT-340Center, HTM-200SE Surround, RSL C34E Atmos, Sealed UM18-22 Sub.
"Micro Theater"-Optoma UHD51A, DIY 120" Spandex AT Screen, Denon X4400H, Sony UBP-800X, Nvidia SHIELD. 7.2.4 - DIYSG HTM-10 LCR, RSL CG3 Surround, Micca M-8C Atmos , 2 4cuf Sealed 18-22 Ultimax.
Shape of Grey is offline  
post #22 of 22 Old 05-26-2019, 03:50 PM
AVS Forum Special Member
 
bluer101's Avatar
 
Join Date: Mar 2005
Location: South Florida
Posts: 2,384
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 624 Post(s)
Liked: 704
Quote:
Originally Posted by Shape of Grey View Post
I've gone through your build, beautiful BTW, but had a question. Do you also have an intake line dumping conditioned house air or just exhausting the "hot" air and let the home HVAC do the rest?
Below is just air exchange not HVAC.

At the bottom of the rack I have the 3U rack grill. That serves 2 purposes, 1 for the fans that push air up into the rack for equipment cooling and 2 at the back of the rack is the 6” duct that leads to the Infinity 6” duct fan. That then pushes the cool conditioned air from the hallway thru the stage and out the stage front grills.

Then I have the same 3U rack grill at the top of the rack. This again serves 2 purposes, 1 for the fans that pull hot air out of the rack from the equipment and the back top of the rack has another 6” duct. This duct is the hot air from the back of the theater right beside the projector. Plus the projector box has a 120mm fan pulling hot air out of the box and right into the side of the air exchange duct, kill 2 birds at once.

When I started the design of the air exchange I read and was told about the issues of possible air recycling from top to bottom of rack. But with my AC return grill for the house right by the top of the rack I hoped it worked out fine, and it did. Cool air naturally sinks so it was a win for the bottom intake.

Here in S Fla when the air conditioner is set for 75 the temp reading on the intake exchange is right around 75-76 and exhaust exchange is around 77-78. The rack has its own temp probe and it’s right around 89 to 92 on high action movies.

Now for HVAC I have only one vent center ceiling front of theater. This provides the cold air during cycles perfectly. Thought about a separate HVAC return but really don’t need it. When theater is not in use the door is open just like any other room so normal airflow. Hope this helps, let me know if you want anymore info.
Shape of Grey and pkinneb like this.
bluer101 is offline  
Sponsored Links
Advertisement
 
Reply Dedicated Theater Design & Construction

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off