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Acoustic Air Vents - help and recommendations.

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Acoustic Air Vents - help and recommendations.

PostPosted: Mon Jun 22, 2020 10:54 pm
by Blott
Hi,
I've recently moved house and am having a new garden studio built at my home and would be grateful for some pointers on acoustic air vents please.
At my last property I'd had a garden studio built from timber (which was great), but because of my paranoia of noise escaping I had no air vents and it got warm...very warm .
My only source of ventilation in it was a small triple glazed window or the studio door (which if opened would have made it pointless to have bothered soundproofing it to begin with).
So this time I'm hoping to improve it a little.
The studio will be an outside skin of solid concrete blocks with a 4x2 internal wall with a 3 inch celotex cavity, 4 inch of rock wool between timbers and a 15mm acoustic plasterboard, skim to a finish. This is mirrored in the ceiling area.
This time I'm hoping to have a couple of acoustic air vents for fresh air and also maybe a little heat dissipation.
I'm looking at using something like this...
http://www.soundservice.co.uk/acoustic_vents.html
It'll be an oblong shaped studio approx 19ft x 10ft (external dimensions) this is very much a home project studio (like my previous was) and full of compromises that a 'proper' studio wouldn't have to make, so the spec above is the best I can stretch to.
Hopefully the design will be soundproofed enough that I don't annoy neighbours and will stop me getting grief from the wife! :)
Is there anything I need to take into consideration with the placement of the air vents?
I was thinking of having them on opposite walls, one at head height and the other low near the floor, does that sound right or would different placement be more effective?
Any advice gratefully received.

Many thanks! :)

Re: Acoustic Air Vents - help and recommendations.

PostPosted: Mon Jun 22, 2020 11:17 pm
by Sam Spoons
Tonyes335 of this parish documented his studio build in great detail, sufficient for it to have been deemed worthy of been and a sticky (and absolutely right IMHO) here :-https://www.soundonsound.com/forum/viewtopic.php?f=24&t=43047 The whole thing is an excellent read and details of the aircon attenuators starts at the top of page 7.

Re: Acoustic Air Vents - help and recommendations.

PostPosted: Tue Jun 23, 2020 12:29 am
by Blott
Sam Spoons wrote:Tonyes335 of this parish documented his studio build in great detail, sufficient for it to have been deemed worthy of been and a sticky (and absolutely right IMHO) here :-https://www.soundonsound.com/forum/viewtopic.php?f=24&t=43047 The whole thing is an excellent read and details of the aircon attenuators starts at the top of page 7.

Many thanks for the response. :)
I had already looked at that thread but tbh it's on another level to the kind of build I'll be doing and I don't have the ceiling height or budget to go to the lengths Tonyes355 has gone to to ventilate his studio build.
I was more wanting feedback of anyone who had experience using a solution similar to the kind of acoustic vents I had linked to and on whether any special consideration had to be given to their placement to make them effective.
Suggestions for alternative solutions are also welcomed, but they'd have to be within my budget which is circa £300 and also logistically viable in regards to labour and physical room required for them to be applied.

Re: Acoustic Air Vents - help and recommendations.

PostPosted: Tue Jun 23, 2020 1:06 am
by James Perrett
I've used two different schemes in the past.

The first was a hole straight through the wall with a home made baffle box over the hole in the inner wall. It certainly seemed to work although I think the general noise level in the room was probably higher than in my current studio.

The second approach (which is the one I currently use) is to have generous lengths of acoustic flexible ducting (like insulated ducting but with holes in the inner skin to allow the insulation to dampen the sound) snaking around in the gap between the inner and outer layer. The hole in the outer skin is offset from the hole in the inner skin to reduce the sound travelling out of the inner layer.

My studio is slightly larger than yours and I have 4 inlets and then 4 outlets which are combined into one inline fan to pull the air through.