I am just going to go back to the 400W. I think the 600W is just way to much for a DR100. It's just over 3' sq on the footprint. I think i would have to run a really huge fan to move the heat out of that small space quick enough. Not something I want to get into. With the 400W there was maybe at worst 1 to 2 deg increase in tent temp over ambient room temp. That is what I want.

Took the Active Air fan back to the hydro store today and they gave me a full refund. My 4" windtunnel does great sucking through the carbon scrubber, blowing through the cooltube and out of the room. If it ain't broke don't fix it right?
ledtime Reviewed by ledtime on . 400W HPS w/4" Sunleaves Windtunnel Fan Just a heads up to everyone. I've looked all over this forum and had to piece together info from several posts. My setup is the following: Carbon Scrubber (18" long x 6" Diameter - Closed cap on one end and 6" to 4" reducer on the the other) That is directly connected to the inlet of the 4" Sunleaves Windtunnel fan. I then have a 4" elbow to a 4" to 6" increaser. Then 6" aluminum flexible ducting to the bulb end of the cooltube. After that it's just 6" flexible ducting out of the Rating: 5