we just finished the ventilation system for our studio (keep in mind it's just rehearsal, not recording)
Our design was VERY similar to the posted thing with a few exceptions. First of all in the wall type unit (like in the drawing) the side that faces into the room has two parts....one that sucks and one that blows.
yeah........
anywho. the intake is right next to the output and are both on the same side of the wall. This causes a problem because no fresh oxygen is introduced. The CO2 filled air is just continually cooled and recooled. The back side of the ac unit hanging outside is there simply to cool get rid of heat.
Here's our solution: (I hope it makes sense because it's working REALLY nicely)
What we ended up doing was putting another 1 hole in the wall on 2 sides. There's 2" pvc going from fresh air through the inner and outer walls and then into the room. Now, we were afraid that simply having these bent pipes wouldn't circulate the air, because the ac unit is stirring it but not pushing it in or out.
Our solution was to run one of the pipes into the intake duct. The intake duct has a closable pannel creating a vacuum. The more we close the intake duct on the ac unit, the more it's forced to get it's intake from the outside fresh air.
Basically we can decided how much air to recycle and how much fresh air to pull in.
As for sound leakage, I'd still watch out for the insulation. You don't want to be breathing that stuff in. we actually didn't really use anything in the ducts and the sound leakage is still pretty minimal so far. Also the system is extremely quiet. I'm pretty sure it's tolerable for recording.
I didn't get any dig camera pics of the system, but have some on film when I get them developed. I'll post them when I can.
