Duct recommendations/advice please; +ReP

Would there be any conceivable problem with the following ventilation setup?


Duct Redcuers are illustrated as: >
Duct Enlargers are illustrated as: <
4" Ducting is illustrated as: =====

4" Carbon Scrubber====<6or8"450+ Inline Fan>=====600W Cooltube=====2nd 600W Cooltube====10K BTU AC Unit=====30 Ft of 4" ducting===<2nd 6"or8"450+ CFM Inline Fan>====Laundry Room Y Adapter shared with dryer===Outside?


I have tried to reason with myself that cooling 2 600W's don't need more than 4" ducting, to exhaust, and I want to exhaust as little air as possible, but keeping it 75-78 degrees with conserving the Co2. Any recommendations is very much appreciated.

I was planning on hooking up the CHHC-1 Environmental controller to turn on the Inline Fans & AC Unit when it gets to 80degrees.

The flaw with my above proposed plan is that I would need to run air through the cooltubes whenever the lights were on, and I would only want to run the AC Unit & the exhaust system when it hits 80degrees. So my new proposed Ventilation system is:

6" Carbon Scrubber=====6" 440CFM Inline Fan====10,000BTU AC Unit=====35ft of 6" Ducting====6"440CFM Inline Fan====Y Adapter shared with Dryer exhaust in laundry room.

Any conceivable problems?