Question for those of you who knows a lot about fans.

I have a 6" inline centrifugal fan 435 cfm. I've heard that you need to match up your carbon filter cfm rating fairly close to your fans cfm rating if im not mistaken. So my question is if i have a speed controller on my fan running it at medium speed would i need a different rated cfm carbon filter to make up for the speed that i am running the fan? sorry if my question is confusing..

well at your fans max speed it moves 435cfm of air. get a filter that can handle at least 435cfm of air... im sure any 12"x24"x1" high quality carbon filter screen from home depot/Lowes will be fine.... i talking about the filters for and ac intake, like the ones inside every house

I always suggest people buy a larger CFM filter than the fan,

435CFM fan i would use a filter of 460CFM or higher.


This way the filter removes 99.9% of smells.





J

jondamon said:

I always suggest people buy a larger CFM filter than the fan,

435CFM fan i would use a filter of 460CFM or higher.


This way the filter removes 99.9% of smells.





J

Click to expand...

agree ive got a 6 inch 450ish cfm fan and a 8 inch phresh filter, think the filter should last longer because its not working so hard? alsi thinks it cleans the air much better.

ok. i think i worded my question wrong. So i've heard that if your filters cfm rating and fan don't match (or not in the same ball park) that the filter does not work at all. My question is since i have a fan that is rated 435 cfm, but i will be using a fan controller to set the speed on medium. Won't my fans cfm rating be some where in the mid 300's since im using a speed controller? and if it becomes lets say 330 cfm with the speed on medium will by filter that's rated at 450 cfm work?

no the filter cfm rating is the max it should be so putting a 600 cfm fan onto a 400 cfm filter is a no no, the filter wont be able to clean the air, also the fan will be restricted with air flow. so yes you can use that filter and slow down the fan and the filter will work like it should, infact probably better because the air is moving through it slower so the carbon can clean it better.

You'll be fine.Not much difference between your fan and scrubber in cfm.If all you wanting to do is provide less cfm to your scrubber using a speed control you are all good.You just don't want HIGHER cfm going through a lower cfm filter.

You all good homie.

All the above advice is solid and right on when it comes to matching fan and filter (with the exception of the HD AC filter).

But I will go ahead and ask the tough question. What are you doing to require a carbon scrubber in the first place? Healthy happy plants don't stink.

Dankster4Life said:

You'll be fine.Not much difference between your fan and scrubber in cfm.If all you wanting to do is provide less cfm to your scrubber using a speed control you are all good.You just don't want HIGHER cfm going through a lower cfm filter.

You all good homie.

Click to expand...

Thanks. Exact answer i was looking for.