Hi - I have an evolution A/C system in my attic, with about 12 outlets. One 6" feed that goes all the way down to the basement, isn't really sufficient to cool it (we knew that when we put it in, but it was all there was room for). I don't mind most of the time, but when I have to work on hot weekend afternoons in the basement (that's where my 'office' is) it gets a bit hot. Yes, I know I could carefully adjust down the other 11 outlets to push more air into the basement, but I could also put a duct blower where the feed meets the main, put the power on a remote control, and just turn it on during those hot weekend afternoons. It probably won't increase airflow when the system is blowing high, but it will increase airflow when the system is on low. (my other option is a window air conditioner in my basement, but I don't think I really need it).
My question: Since the variable speed fan adjusts for constant airflow, will an active cfm sink (like a blower on a feed) confuse the fan or otherwise mess things up.
(and please don't say my contractor should come and balance the system - read my other thread (Did i buy the wrong furnace) to understand why he's not coming back 8-})