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But if it's sucking up all the air and not bringing in air quick enough, without a fan, is the plant getting enough fresh air?

Awesome, thank you! Do you have an equation for an input fan incase there is too much negative air pressure?

Awesome advice thank you both! Going into a store to look at a few today!

Wouldn't wrapping that end lower the cfm of the filter?

I'm running a 300 watt led, I was afraid the 190cfm could possibly cause too much negative air pressure, but I am assuming it would work better for the smell since its pulling at a faster rate

Thank you, may I ask what the difference would be with the 170 compared to the 190. The reason I'm asking about the 190. 2x4x5= 40x3.5=140 cfm req. 190 cfm fan with carbon filter I'm told will bring it down by 25%--> Now the fan will push 142.5cfm with the filter attached. Am I right or have I...

This is not helpful :(

Howdy! My space is 2x4x5 I would perfer not to use a speed controller. I want to run a fan with a carbon filter. what cfm rating fan should I aim for based on my room size?

2x4x5 room Should I get a 4 inch fan 190 cfm or a 6inch fan 347 cfm. Either fan will have a carbon filter attached. And will I need a fan speed controller on either. Thanks everyone!

I would be able to run a 6 inch filter, I love te answer, very Informational. I have a follow up question. I found the same fan that you have online, 190 cfm but for 200$, I found a 6 inch fan 347 cfm for only 20$ more(great review on product for quiet noise). Should I get the 6 inch fan? Stick...

I didn't know a 4 inch fan could pull through a sucker that big! What's the cfm rating on the fan? and what size(cfm) fan would you reccomended for my 2x4x5 room? And what cfm rating carbon filter should I buy?

If I have a 2x4 room and use a fan and carbon filter scrubbing the room at a rate quicker then normal, will it affect the lifetime of the carbon filter or does the life of the filter depreciate through smells absorbed(dirty air)

Hello all. This is a new project I am working on. 2x4x5 grow space. I will be running one 300 watt led. Cubic space is (2x4x5) =40 40x 3.5= 140 cfm is what I found for exhaust requirements. I'm stuck in the matter of having such a small space I am limited to what I can buy. I want to know -...