On Fri 27 May 2005 07:31:39a, Gary V. Deutschmann, Sr. wrote in alt.home.cleaning:
Thanks, Gary. A brilliant idea to a dusty problem. I have only used a duct fan once. That was for a duct leading to an isolated 2nd floor room that didn't get adequate air supply. It had a built-in sail switch that turned it on and off with the force of air coming from the furnace. Luckily it's air flow label was correct. :-)