lrrowe wrote:Actually I was going to try a fan I have that is similar to this.
http://www.ebay.com/itm/like/3812765302 ... noapp=true
I was going to simply place it in front of my incoming vent to see if there was any improvement. Worst case is that I have to shorten the incoming tube. I will be honest and say I never considered the length/distance issue when I laid out the design.
its not the length of the added duct as much as the rise of the pipe. The fan just doesn't have the power to push it up there. In the AC business we call it static pressure loss. A typical AC system is designed to operate at a certain static pressure to achieve a certain amount of airflow rated in cfm's. Deviate from that static pressure and airflow suffers. In the Ac business there are ways to compensate for it. Its hard to do in a window a/c since its really not designed or rated to run with duct work attached to it. The fan you mentioned would help but as I said before, it"ll also change the air temp somewhat. The closer you can get the fan to the actual outlet off of your plenum/distribution box on the front of your AC the better off you'll be.
I hope this helps.