What size carbon filter

I have a 4x4x5 grow tent what size carbon filter would handle the tent full of plants?

I use this one for a slightly larger space and it works pretty well.

http://www.htgsupply.com/Product-A-GrowBright-Pure-Flow-6-Carbon-Filter.asp

I am running it through an air cooled hood with a 170cfm exhaust.

I have to use a reducer as my exhaust is only 4". In a perfect world, I would have a 6" exhaust.

Well you first need to figure fan cfm. In a 4x4x5 room you only need about 100 cfm. Add in a 600 watt light and then you need about 125, add a few extra for ducting and ect and you need about 150 CFM exhausting.

Here you go

http://www.canfilters.com/canfilters_33.html

MYOB said:

I use this one for a slightly larger space and it works pretty well.

http://www.htgsupply.com/Product-A-GrowBright-Pure-Flow-6-Carbon-Filter.asp

I am running it through an air cooled hood with a 170cfm exhaust.

I have to use a reducer as my exhaust is only 4". In a perfect world, I would have a 6" exhaust.

Click to expand...

That filter has a 265 cfm min rating, not the best choice unless u run 300 cfm or more through it. Max rating is more important but you want to be closer to minimum.

I run a 6" 440cfm fan with a 6x24 540cfm filter for my 4x4x6.5 tent that runs a 1000w'er, but ran the same with my 600w'er.

Dude, just chiming in but i made mine and it was overkill on my last harevest 400/600 hps. wallmart activated
carbon, you know.

I thought so too but it has no problem drawing air. It actually rips the velcro off the separation door between veg & flower rooms. Thats two 3x6x7 rooms with a 4" passive intake from outside. The intake enters the veg room and there is another passive intake in the top of the seperation wall between veg & flower. The filter is in the flower room and runs into an air cooled hood and out. You can feel the suction with your hand at all intakes.

The fan is on a speed controller set at med/hi.

word, i set my fan to a dimmee. I use a squirl cage and a flange and screw nin on in the garge and suck it out and filter it out the attic. one of the stanly yellow squirl fanns, they are cheep and keep a room cold

MYOB said:

I use this one for a slightly larger space and it works pretty well.

http://www.htgsupply.com/Product-A-GrowBright-Pure-Flow-6-Carbon-Filter.asp

I am running it through an air cooled hood with a 170cfm exhaust.

I have to use a reducer as my exhaust is only 4". In a perfect world, I would have a 6" exhaust.

Click to expand...

/\ look at the combos on the site he suggested and get the $120 more than enough says:

Effective treatment requires the exchange of air in the growing area in a period of 5 minutes. Compute your requirements by multiplying the width times the length times the height of your growing area to obtain the total cubic feet. Divide this number by 5 to determine the proper filter size needed.

BatCave said:

I run a 6" 440cfm fan with a 6x24 540cfm filter for my 4x4x6.5 tent that runs a 1000w'er, but ran the same with my 600w'er.

Click to expand...

I like this setup, run mine on med speed for a 600w and does very well. I too reduce to 4", but no issues there. Better a bit too much carbon than not enough!