I believe it is 1.5x exhaust. I've not seen it listed as 1/2 size. But you could be right. Let's have others weigh in please!

As for grow guides, check the stickies at various levels of these forums. Stinky Attic has done a lot of the best work. See this:

nOOb Guide to Growing da Dankness

You will find stickies at all levels on this board. They are worth looking through. See the stickies here for example:

Basic Growing

And the sticky guide to grow room setup in my signature is well worth a read.
bigsby Reviewed by bigsby on . New Grower. Will my setup work? Hey there. So I'm trying my first grow with 2 plants of Strawberry Cough. So far, Im thinking a 400 watt HPS light with air cooled reflector, a GrowLab 2'7" x 2'7" x 5'1", a 425-500 CFM inline fan w/ heat shield/sound muffler hooked up to a 6" x 16" PHAT carbon filter. I'm going to use a 3" passive intake. Does this sound like it will work? I plan on using soil. Any nutrient concentration recommendations? Also, how high do the HPS lights have to be from the plants, and can they be Rating: 5