ventilation.. is my CFMs for my intake and outake correct?

[Jayson420]

positive/negative air pressure concern with a 4 x 4 x 7 Tent: 112 CFM needed for 1 ACpM (air change per minute)

Equipment
1. ValuLine 4" Centrifugal Fan - 171 cfm (connected to reflector "400 watt grow light system" to exhaust heat/smell)
http://www.bghydro.com/BGH/itemdesc.asp?ic=AEFCPVL04

2. Suncourt 4'' 80 CFM Inline Duct Booster (pulling in air from outside for fresh air intake)
http://www.homedepot.com/webapp/wcs..._mmc=shopping-_-googlebase-_-D26X-_-100073963

3. 4'' insulated duct
http://www.homedepot.com/Building-M...splay?catalogId=10053&langId=-1&storeId=10051

4. 4'' Carbon Filter

I have the Carbon filter connected to valuline centrifugal fan with 4 feet between fan and filter. Is this good? Right CFM intake & outake for a 400 watt grow in a 4 x 4 x 7 tent? No positive/negative air pressure problems? Any help will be greatly appreciated as i usually grow outdoors!!!! Thanks

 

[TribalSeeds]

Lose the intake. I've never needed one in a tent. 4" wouldn't have been my choice. I think most filters will cut cfm in half. Summer is a bitch

 

[Jayson420]

Lose the intake. I've never needed one in a tent. 4" wouldn't have been my choice. I think most filters will cut cfm in half. Summer is a bitch

TibalSeeds, So you're saying it would be better with no 80 CMF intake? Doesn't the plant need fresh air? Wouldn't an exhaust only/No intake create a positive/negative air flow issue? I'm an outdoor grower so a lot of this is new to me.

but i'm looking to squeeze 5 plants in a 4 x 4 tent under a 400 watt and hoping to get 8 oz. total plants are already 2 -3 feet tall. thanks

 

[Jayson420]

So i guess I do no intake because...

Well what could happen is smell could escape through the intake, and you can end up with positive pressure in the cab, and stale air. Most grows don't really need a intake fan, just a exhaust fan, and a intake hole , so you have negative pressure in the room, or cab, which means no air will escape, except out of the exhaust.

so even if the hole at botton is only 4'' the exact same as exhaust and not 2x . I will be ok?