cab question

I just recently finished building my cab, I have a few more things to pick up if needed. And that is where I come in and ask for some professional help. My cab is 4.3'x2'x3.8'. Now I know that the first returning comment is going to be that I don't have enough height, well, I do. I am planning on doing some scrogg growing, and I figured everything out before I built my cab, althought I wish I had a minimum of 6" more of height. Now with the space that I have, I figured that a 90cfm fan would be plenty(bathroom fan from RONA), but after hooking all of my ducting up my temps are still mid-high 90's. So my first question would be, should I put an in-line ducting fan into my ducting? It is rated for an additional 160cfm. See fan here: http://www.homedepot.com/prel80/HDUS...4+3573&pos=n05
The carbon filter that I have is a 94cfm can filter, what I was wondering is. If I add this fan to my line of ducting, will my filter become utterly useless?
And my second question in relation to the fan, can the cfm rating of a fan be reduced by the length of your ducting? if so, if I put that fan into my line, can I add more length of duction to reduce the cfm?

MEME

anyone?

Would it make sense to put a window a/c in the room.

it would if I had the money and if I wasn't moving after this grow.
Should I be fine with the temps for this grow? Or will the temps kill my plants eventually and destroy my crop?

MEME

I will not kill the plant if you can cool it down a bit at night. I ran one of my grow rooms at 90 degrees with high humidity. Think of a green house in the day time. 90 degrees is the min temp usually. My ladies where fine. I would keep a fan on it

This is what I am working with, and this was having my can on for about 2 hours.
Pic 1. cab temp is 40c/104f at 37rel. humidity
Pic 2. layout of the cab, you can see everything in the pic, minus electrical
Pic 3. This fan is on high speed so I can hold my hand underneath my light for a minute plus.
Pic 4. This is the venting piece where I would be adding the inline fan and laying some ducting on the floor and having my carbon filter on the same side but at the front or vice versa.
Pic 5. This is the fan that I have in the cab right now for air movement.

Should I be fine for this grow or should I do some more tinkering? I would like to put my ladies inside my box tomorrow if I can to get them going under some good lumens. Any insightful ideas?

MEME

Dude, dun put anything in that cab less you can control the heat for 24/0 for at LEAST 3 full timer cycles. Thats just not safe man. To hell w/ the plants you dont want a fire.

Right now I am looking for a 6" in-line fan to add to my duct line... and then I may have to put a speed control on it(not too worried)

so my babies are stuck in my computer for the time being, I need to act fast though, they are starting to get big...

MEME