Does size matter?! 1O" fan vs 8" fan

I have a 11 x 16 x 8 room currently running 4 1k lights {but will be 6 lights next run} All are aircooled hoods.I want to pull exaust through charcoal filter through lights out room,and pull fresh air in from outside.What size would best fit the job? 8" or 1o" fan? Would 2 fans be enough? any help much appreciated,cheers HBR

I'd say its best to have more capacity than you need, then dial it down for quieter operation. I went for 10" intake, 12" extraction and one of these.

Thats what i was thinkin,these fans are expensive gotaa save some dough up! Cheers HBR

One twelve inch should be sufficient in a Vortex...