400w hps cab, ventilation, carbon filter

so i have double door cab 5' x 2' x 3'
1-400w hps cost = 8 hours of work....
3 pc fans ( 2 -80cfm exhaust into a 8" x 2' x 3' area with one 40 cfm pc fan with a carbon filter on it exhausting into a open room)
i have reflective material on the inside,not sure what it is but, its all white one side but all reflective on the other...
no intake at this time just the leaks from the doors, that are getting weather stripping
how big of intakes do i need?
i am planning putting 2 - 2" passive intakes on it, would that be enough

as of now about 3 feet hight the temp is about 85 degrees after 30 min
only pic i have is terrible but here it is



this will be my second grow check out my first one



right down here
VVVVvvvvVVVVVV

the set up im building now, will almost be identical except for that 8inch gap up top...I starting to question my vent set up now....its my first grow, let me know how ya do

beachybum said:

the set up im building now, will almost be identical except for that 8inch gap up top...I starting to question my vent set up now....its my first grow, let me know how ya do

Click to expand...

will do i've been kinda busy so no work has been done, ill try to get on it this weekend i'll keep ya posted