I made an intake and outtake for my grow spot.. I used insulated ducting, took the insulation off and cut it in half.. I used pne half going from my air conditioning vent to the top of my grow spot where my lights are (most of the time the AC is on, when its not, I have the fan on) and I used to second half going from my fan (originally for air circulation) to a dryer vent on the side of my house.. It works very well, better than I expected..
@metroplex - I've done this 3 times prior to this with the same light setup, and I ALWAYS go 12/12 from seed and it works perfectly.. When I started I only had 136 watts, now I have 237.. Also, I have mixed up a good 60/40 batch of soil.. I'm going to be using that when I transplant..
***UPDATE***
One of the six seeds were dead, it never sprouted a taproot.. I threw it away.. The rest went in the ground.. Only 4 of them popped, and I dug what looked to be a dead seed with brown taproot out of the soil on one.. Oh well, thats 4 seeds that have popped outta the soil, growing fine.. and its ICE, so its gonna be great when its done.. I've been smokin this same strain for the last 3 or 4 months from my dude, I'm planning to make it look better than his..