DR240 Extraction set up HELP (please)

Ok, so i have my plants 2 weeks old, from seedlings (see pic) all looking ok..

Today i erected my DR240 all ok..:) :thumbsup:

I have a few questions before i invest in extraction, or rarther confirm with some experianced growers my best extraction set up..


DR240 Enclosing 3 16 Pot Wilma Systems___ 2x600w Air Cooled HPS lights above each system 6x600w HPS in total

Ok so i have done some research and have come up with the following extraction system

TENT EXTRACTION ( 8" RVK with Rhino Filter ) Piped through a brick wall to outside but reduced to 6" on the outlet spigot ( would this be ok )..???

INTAKE FAN ( 6" RVK )

LIGHTING EXTRACTION

2 x 6" RVK Fans used to cool the lights, 3 lights on each fan

1 fan ( 3 lights) will be piped straight through a brick wall to outside

1 fan ( 3 lights ) will be piped using a "T" peice into the 8" extraction fan

Intake and extraction fans are contralled using a Twin Fan (Temperature Controlled) Speed controller....

Any suggestions or feedback on the above suggestions would be grateful and helpful, i am a Electrical Maintenence Engineer by trade but extraction and the "correct" way to run it isnt my strong point, appologies if these questions come across as very basic..! NEWBE>>:rastasmoke: