Custom built grown room HELP

HI guys newbie to the site here, right ive built a grown room in the loft the dimensions are 2mx2mx2m all fitted with silver foil back insulation, i have a big enough carbon filter to do the job, iam debating on using 4x600w hps grow lights or just 3x600w hps, i am looking to hold 16 plants useing coco and air pots and i may add drip irrigation. the only thing iam missing i believe is a cold air intake from outside, what sizes air intake would be suitable? the carbon filter hot air will be pumped through the roof. Also the the insulation over one an other i will be using foil take the close up the light gaps.

Anyone got suggestions on how i can improve this room

Overkill on the lights bro. I have a 4x4x7 and one should six is plenty. Three is going to be he'll to vent and keep cool unless you can get a portable a.c.. is the room enclosed? I would go with two sixes with a 440 fan filter combo and run the two sixes in conjunction. With each other and exhaust it that way. Make sure your filter is at the suck side of the fan so it can best eliminate odor. Are your lights dual spectrum? I would section off a space and use my third six there for a veg room and get a my bulb that way you turn it into a veg and flower room to alternate and have plants steady budding. Maybe even build another small room and have it as a mother room. You look like you got it pretty well built thought from what I can see.

Hey bro, fellow attic grower here.

I would stick with 3 600's for that space, and have a 6" intake.

Are you aware of the challenges with attic growing? The attic will heat up very quickly in the summer with the sun beating down on the roof while using hid lighting, I run lights on from 8pm - 8am to help this. The opposite can be said for winter, gets very cold in the attic, so much so I have to run heating during lights off in the cold months.

Another thing, you will prob want to put in some kind of water proof base, when watering small amounts of run-off can find it's way through the floor and destroy the ceiling in the room below, especially when using airpots (speaking from experience )

You have a great space to work with there mate and i wish you all the best with your green thumb venture

2 meters = 6.561 feet

6.56 x 6.56 = 43 square feet.

To stay around the minimum 50w per square foot of canopy,4x 600w HPS's...

2400/43= 55w per square foot.

Lol shows what I know. I'd still split the room and have a flow and veg chamber. More bud faster less wait in between.