Critique my list/plan, new 2x600 watt set up!

Hello all, just getting together a plan for my new grow.

I've grown twice under a 400 watt hps before and didnt do it right as regards temps and humidity, I just threw the light in the closet and harvested small buds!

This time myself and a buddy have a bit of money so we are going to do it right!

Strain: Critical Mass (clones), 20 females vegged for 3 weeks each, grown in soil

Veg:
400 watt MH + 200 watt fluros
Flower:
2x600 watt Cooltube HPS

Air out:
Inline air extractor RUCK RK INDOOR UFO 25cm - 1200m3/h with carbon filter

Air in: Not so sure?

Thermostat for Inline air extractors and fans


Digital Combo Thermo-Hygrometer
Digital Timer

We're planning on building the grow box ourselves, and having a seperate veg room to have a perpetual harvest.

Any thoughts?

If your passive intake is large enough the vacuum created by the exhaust is enough. Also if your using cool tubes or air cooled hood you should just let the fan run. You don't want to let the light heat up. I use a 6" centr. fan with an aircooled 1000watt hps and a passive intake and the temps inside my 4x4x6 box are the same as ambient..
Good luck with your grow....

lol doing the same myself 21 plants in total 19 critcial 2 skunk num 1 (given free) grown from feminised seeds inside secret jardin tent using 2x 600ws in that soil that cost me over a ton but is pre mixed organic stuff u dont need to add anything to. veged for 10 days been flowering for 6 weeks 2morrow. Il get some pics for ya, will take bit though is over mates houese.

Spent total -bout 700 hoping for bout 30 - 40oz's but got the cuttings tent etc to use again