Air

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Fret

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I am finishing my basement and I will be building a room within a room for my studio. I will probably only have about 2 to 4 inches in-between the two walls. I understand that this is not an ideal air space but in the interest of keeping the room as large as possible I believe this will be the best way to isolate my walls. My concern is that if I completely seal the walls I will have no way to bring fresh air into the studio (room full of people with no air = scary). I was thinking about venting the room to the outside with a 4-inch duct a small fan and a series of 90-degree bends. Has anyone else done this and what is going to be the best way to get a vent into the studio without having a direct penetration through both walls?

Also once upon a time I ran across a web site that sold kits for acoustical treatment based on room size (rectangle rooms only kind of thing). The prices actually weren’t too bad. Does anyone have any ideas where I might have been? I haven’t been able to find the page again.
 
Also once upon a time I ran across a web site that sold kits for acoustical treatment based on room size (rectangle rooms only kind of thing). The prices actually weren’t too bad. Does anyone have any ideas where I might have been? I haven’t been able to find the page again
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I just ran across stuff like that at macmidimusic.com

Happy Seasonal Greetings :D
Kevin.
 
I'm not sure how much space between your walls would be ideal, but you're on the right track in considering 90 degree angles with the ducts. Put the bends in pairs, about a foot apart:

____________......12....___________....12.....______>>>>
....................|______|..................|______|

Also, look into different muffler designs for within the ductwork. They can work very well if you use the right type.
 
the 10-12 inch spaces should correspond with the verticle stretches. Sorry about that. I would change it, but after the little schematic below, I already feel like I've programmed that Atari game, Berzerk.
 
So how should I run the duct into the room through two walls? The wall I am thinking about coming through is not a major concern for sound transfer (laundry room and easy to turn off the washer). I am wondering if I should bring the duct in through the ceiling of the laundry room and small hallway (also only slight concern for sound) and in to the first layer of sheet rock near the ceiling. Within the same stud space but near the floor I would duct from the inner layer of sheet rock from the outer wall to the inner layer of sheet rock on the inner wall. Then within the studio I would put the vent in the wall near the ceiling, still within the same stud space. One duct would have a small fan pulling air out of the room where as the other duct would be just an open pipe. I am thinking that this would filter the sound through all of the wall insulation instead of just into the duct. I hope the diagram translates. Just to clarify the diagram is of one set of pipe. I would have another set with a fan in it at the other end of the room. One set to bring fresh air into the room and one to pull it out/ the fan would cycle air through the room.
 

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Fret said:
I understand that this is not an ideal air space but in the interest of keeping the room as large as possible I believe this will be the best way to isolate my walls.
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What is the 'ideal' airspace?
 
Unfortunately I can’t remember where I read it at but the theory was 6 to 8 inches of air space for insulating purposes. Sorry I can't back that up.
 
Had this very discussion a coupla weeks ago on another forum - one guy who's been around the block a few times and actually measured the effect of increasing the airspace settled at about six inches as optimal...

'Nuther good idea would be to drywall both sides of both walls - gets ya a lot of added mass.

I wouldn't worry too much about 2 fans - if ya put in one as an exhaust fan it'll pull air in thru the inlet - and ya can put a lot of air thru a 4" pipe...

Bill
 
i tend to go for the wider duct 1' x 2' lined with insulation and going out a window space if available. Moving more air but slower is quieter overall. Don't under estimate air - I always ask the air guys to increase the fresh air content as well.

cheers
john
 
Point well taken, John - with a duct that size (that's as big or bigger than the main plenum on most furnaces) ya prob'ly wouldn't even need the fan(s)...

'Nuther thought with regards to the 4" (outlet) pipe - if ya got a plumber's alley available you could run that rascal right out the roof, let the chimney effect serve as fan...

Bill
 
Actually my thought was to have one fan in one of the ducts, and to just leave the other one open. I’m pretty sure that I would be ok with out the fan in fact I will probably only use it when necessary. I just think being able to cycle in some fresh air would make everyone feel a little better, especially in those long sessions after Taco Bell.
 
I used 8inch dia. flex duct 25 ft long with several 90 degree bends/ mostly just bringing in outside fresh air. But I also have a small AC unit for the summer heat.
The air comes out slow but very quiet, I went right through double walls with no problems. Just do it!

Dom:o
 
cwh said:


'Nuther good idea would be to drywall both sides of both walls - gets ya a lot of added mass.
Click to expand...

I am actually doing this on my new studio contsruction project.
 
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