With summer approaching and the humidity rising I purchased an air conditioner. The model i bought has a 4 inch exhaust duct coming out of the back of the unit. My carbon filter is connected to the front of my air-cooled lights which then exhaust the air into a crawl space. Basically air is pulled threw the carbonfilter by a turbo fan and used to cool my lights and then another turbo fan exhausts everything out of the room. Soooo.. i was going to just exhaust my a/c unit into the crawl space separately because i have no way to hook it up to my carbon filter. But im afraid the exhaust from the a/c will wreak since it will not have been carbon filtered before it exits the room into the crawl space. So how does everyone exhaust their a/c units?