Ventilation question

I currently have 4 plants vegging in a darkroom 1x1x2m under a 250w cfl with shade with a 6" OS fan inside and a side flap open its a constant 75-77f and 50% humid.

I will be flowering with a 400w HPS (with 6 plants) in another same size tent.
Will a RUCK 5" or 6" fan and filter at the top and another 5" intake at the bottom be enough or should I opt for 2x 5" RUCK intake fans?

Thanks guys

ps new darkroom tent arrived yesterday and id highly recommend it, Excellent product.

Yea you know whats up but your intake doesn't have to be that big. If you can just cut a slit in the box and that'll be enough intake...negative pressure will suck the air in keeping smell from leaving also. If your worried about light getting in or something like that just put in like 2 inch piping and have it bend downwards.

ive got a tent the same size with a 5" ruck fan and filter at the top and thats more than enuff to give negative pressure and draw fresh air through the tent flaps at the side, ive two friends with the exact same set up as well. although i do have an oscillating fan outside of the tent that blows at the tent flap and swings round to blowww on my ballast.

Thanks for the replys, I'll get the ruck 5" & filter see how it goes.
Dura72 how many plants you fitting comfortably in 1x1x2m?

Cheers

5 right now, i had 6 but its too many when ur around 3 weeks into flower, i had to rig up another light in a bedroom cupboard to move one. next time i'm gonna veg ten and split into two tents. after that i m gaunna buy a 3rd tent and have two veging tents and 1 flowering in order to move towards a perpetual harvest.

GrowingfortheGold said:

Yea you know whats up but your intake doesn't have to be that big. If you can just cut a slit in the box and that'll be enough intake...negative pressure will suck the air in keeping smell from leaving also. If your worried about light getting in or something like that just put in like 2 inch piping and have it bend downwards.

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very true. i have a intake fan in my window but leave it off most of the time. i only turn it on when temps outside climb. but all the other fans and my exhaust fan does pull enough freash air into the room.