And all you would need is 4 inch fan & filter.
That's what I'm doing !! Like today, is day 32 bloom in the lec tent, and yesterday, was flip day for the 4 that I've been vegging for like 6 weeks under a 430w hortilux, turned back to 275, till now. I know the 400w wont completely cover the canopy, but It'll have to do. Plan is to harvest the lec tent about the 10th. of May, and by then, the 400w will be 30 days into bloom, maybe move them to the lec tent for final 2-3 wks. ?
And then there's my other 4x4x6.5/ t5 tent, for WHATEVER !! It's a jungle in there !! But that's where it all comes together. Kind of over stocked right now, as I've lost my outside plot ? Sucks !!