Maybe I can build this box fan:
http://www.artglassanswers.com/forum....php?f=22&t=90
an use this:
http://www.homedepot.com/webapp/wcs/...5673%2d%5f%2dN
Is the best place for the make up air coming from behind? or would it be better to have the make up air come from two windows on both sides?
Thank you