Cheap ventilation

What is the best way to ventilate the studio without affecting the sound proffing. I don't need AC (live in UK, lol). Just some sort of fan and ducting. Any ideas

Check this out, minus the AC and "chiller room" - http://www.johnlsayers.com/phpBB2/viewtopic.php?t=644 :?

So basically I just need a fan in and a fan out with some ducting that truns a few corners. Do I need to line the ducting with sound absorbant foam?

Either that, or use acoustic ducting such as Johns Manville's Super Duct - Rod told me they actually will help DIY'ers find their products locally, as opposed to Owens Corning who don't seem to be very helpful to anyone - If you can find it locally, the Super round http://sweets.construction.com/index/pr ... &pid=20043 would work well with an inline "booster" fan i I found them in 4", 6" and 8" at Home Depot, bought one of the 4" for a reality check on noise and was surprised that it's pretty low (my SLM doesn't go down low enough to measure it, but it's just a cheap Radio Shack one - looking at one about 10x the cost now) - I bought the 4" because of a vocal booth project, gonna try it with a combo of 4" ABS and dryer vent hose. The 4" inline fan was about $23, think the bigger ones were around $40. For contact info, check JM's site here - http://sweets.construction.com/index/mfg.htm?id=15525 Remember that moving air causes noise that is approximately equal to the 4th or 5th POWER of velocity - so oversize ducts and slower fans are vastly superior for your purpose - if the duct fan I suggested were too noisy but also provided more than the necessary air, a motor speed control might improve things quite a bit. Also remember that I've NOT done any of this yet, other than to acquire a 4" booster fan and plug it in to see how loud it was (pleasantly surprised) - Bottom line- I'm not saying that this WILL work, only that it's a possible way to try... Steve Oh, BTW - Rod Gervais (vastly more knowledgeable than I on this subject) told me it was better to use just a fan on the OUT duct - that it would cut down on inside noise because of the location of the noise source (fan) in regard to air flow...