Quick question about fresh air?

So, I've decided to use a portable A/C unit to cool and/or heat and/or de/humidify my CR. Based on what I've read and researched for the passed week, and to suit my budget (more importantly), I'll be using a single hose unit in conjunction with a separate system to provide fresh air. Sounds quirky but for my situation I'm going about the exchange chamber, aka "chiller room" to get the fresh air, as alone it can't provide the cooling/heating that I'd need. Unfortunately the situation is not flexible enough to make it provide enough A/C. Going by Rod's suggestion for this method (in his book) I'm placing the in-line fan in the return duct, but I've also seen the fan placed in the supply duct instead. Is there a difference where it goes? Can/should a fan be placed on both, or would that in some way not let enough fresh air stand? Considering the portable unit will generally create a negative pressure, does that play a role in where the fan should go? (ex. if in the return, wouldn't that create a further negative pressure?). Also, I would realistically use the A/C for about 3-4 months out of the year here in Brooklyn, so that 'negative pressure' wouldn't always be a concern. Perhaps a fan on both supply and exhaust that is switchable according to the season? I've considered holding my breath at all times. :| help?

DannyRico wrote:

Going by Rod's suggestion for this method (in his book) I'm placing the in-line fan in the return duct, but I've also seen the fan placed in the supply duct instead. Is there a difference where it goes?

I'm guessing that with the fan blowing "out of the room" via the return duct, you might hear a bit less of the noise of the fan itself from inside the studio. As long as you still have an "air goes into the studio" duct, the air pressure will want equalize itself automatically, and be drawn into the "in" duct, cause that's just what air does (otherwise, none of these fancy slot resonators, tube traps, speakers, our ears, and the like would actually work).

great point. yeah, i suppose that becoming obsessed with the utmost elite answers to studio design questions led me to think i was building an anti-gravity vacuum. overlooked air as simple and vital as it may be :roll: