Howdy folks....
Hi back at ya FN
oops sorry clicked a bit soon, doing an edit here.
Anyway NoLogo, I didn't see if you had an option of using something like a flexible dryer duct and a small fan maybe?
I have a similar problem in that I am holding out to run the A/C because of electrical fees. Using a 400HPS, 2-150HPS and another 400 MH, and in another area 2 T5 4-bulb HO's....My 'space' gets perty
warm like 86 or 88 approaching the "90f no photosynthesis point" but I use two regular window box fans on the floor and one Lakewood 12" fan on the wall at bud height (for now). I too open the space once a night and pull fresh air from outside.