grow room setup - setting up ventilation??

I have just started assembling my flowering space which is a 5/5/3 triangle 6 feet high insilated w/ white reflective mylar. Im' using an inline fan that apperantly moves 130 cubic feet per minute which will be split so that it both exhausts and supplies the room with stale/fresh air. the exhaust will first be link through the cooling tube around the lamp and then exit the room. another fan will be directly connected to the carbon filter. the room itself is pretty much 100 percent light proof. It is in a corner of my bedroom and even at night with all the lights off except the 1000w you can see no light leakage. i plan on flowering 12 plants under it per cycle.
questions:
should i use more fans for ventilation?
if i want plants around 3ft high, how long should I initially veg them
(assume feminized rooted clones are used)???
thanks, opinions of any type always appreciated

Well, you may not want to revent the hot air from the HPS back into the room if you can avoid it and if I understand the set up correctly. I would think about trying to use the larger of the two fans you have and put it on the cool tube and the scrubber and use the smaller fan to draw fresh air into the area. Also, put a small rotating fan in there to creat some air circulation that will help strengthen the plants stems and branches and remove and carry O2, CO2 and moisture that the plant is disapating and absorbing from and into its leaves.
Hope this helps some
Adieu