Sorry.
Basically you want to suck or blow more air into the tent. (Just a little less than you're exhausting. That will create negative pressure. Negative pressure ensures your smells don't leak out and basically means you're exhausting more than you're bringing in.)
You could open the...
Hey friend, from the looks of the first picture it looks like you might need a bigger intake? Maybe active instead of passive? It just looked like the tent had ALOT of negative pressure. That helped me in a similar situation. The exhaust can only do so much, so if your outside tent temps is 10°...
re: Prep & Build Journal for Attic Indoor Grow - Using 400W HPS & Soil Medium
Can't wait to see what you come up with. Looks like a good space. What's your plan for flooring?