Help needed with digital timers and controls

I have a 10x10 room with 4 1000 HPS. 110v ballast

For exhaut I have a 695 cfm inline vortex fan and a carbon filter, insulated 8" ducting running through the lights exhauting to outside.

I have a Co2 tank and regulator

I have a 110v dehumidifier

3 rotating fans for circulation

I need help finding the most cost effective way to link my accessories.

For my exhaust, I am running my fan through a speedster speed control, what kind of timer should I use, how often should I vent and for how long?

What is the best way to monitor Co2?

It seems as if something like the Sentinel EVC1 would be perfect, does that need a 240 circuit run to it?

I am ready to make purchase so any ideas will be greatly appreciated

dryer duct and hose clamps with some type inline fan make sure cfm to light ratio is good