Carbon filter size

I need help on a size for my 4x8 tent. I will be having 2 1000hps and about 25 plants per light. Now what carbon filter/fan should i use for smell? With that many plants i was thinking just buying a 8inch carbon filter/fan combo...For the smell and i think the 8inch + will be wll enough for the heat from the lights...What do yall think?

yea a 8" should do good with the size of your tent, just make sure the filter fit, not just in size but also that it can take the same air flow or more (CFM)

how will you grow em ? vertical or horizontal ? no matter what you should consider a cool tube/hood on them 1000K lights

Size your fan, then get a filter to match that rating.
The dimension of the filter do not necessarily match up with the cfm rating.


I don't know much about the cooling associated with two 1000W lamps. Will you have one duct with two reflectors & the filter?
Growco has a fan calculator I use as a starting point.
Assume your tent is 7' high, 8x4x7 w/2 lights = 375 cfm fan recommendation. I would start with a 400cfm fan.
Can fans are a good industry standard. Can fan offers RS-6-HO: 6" High Output fan, 440 CFM, weighs 9 lbs.
Again, just one data point for you to consider. Please note this 'calculator' does not take into account the lamp wattage.
I would recommend you continue to get input on your specific fan needs.

Assuming 440 cfm, Can filters offers:
CAN 50 FILTER: 420 CFM - Dimensions: 19.7" long x 16.5" wide - Weight: 55
lbs.

CAN 66 FILTER: 412 CFM - Dimensions: 26" long x 12" wide -
Weight: 46 lbs.


That is a lot of plants. 25 plans & 24 ft2 does not appear to be a good match. I would consider few plants.
Good luck with your grow ! Send me some buds !!