Fan+Filter CFM, what do you think about this set up?

[hot cheetos]

My room is 10x10x6.6 (120x120x80 secret jardin)

I have a 10x39 1400CFM phresh filter and a 10in Hyperfan rated at 1065 CFM

Does that seem fine? Is it ideal? If not, what would have been better?


And the 2nd part to the question, what size should my intake fan and filter be?

 

[Granger2]

1st part-Fan/Filter combo should be good. 2nd part- Many ways to go. Actually I prefer passive intake. You would need twice the sq in of intake as exhaust. Use pi x r squared. That can be any shape as long as you have at least 78 sq inches, eg 9x9. I'd suggest using an AC filter in a size that can easily be found at the grocery store. Good luck. -granger

 

[hot cheetos]

I know that a carbon filter is supposed to have slightly higher cfm rating than your fan, but what happens when it is SIGNIFICANTLY higher? I'm trying to understand the physics/math behind it. Say a 1065 cfm fan is attached to a 3000 cfm carbon filter...what kind of effect does this have?

I would really prefer to not use passive air. I don't have a carbon filter on the intake, its just a regular phresh intake filter. Doing the math, 25% reduction on the 1065 fan due to the carbon filter puts it at 800cfm exhaust. About 20% reduction on the 400cfm puts it at 320 cfm intake. I thought that should be fine but it isnt NEARLY enough. If i keep the fan at 100% (800cfm) the walls of the tent concave so hard so fast that i quickly turn it off because it looks like its literally going to break the tent. I need someone to explain to me the math behind exhaust and intake CFM. A ratio where i would get slight negative pressure to keep everything inside.

Am i just over complicating it in my head? Logically if you have 800cfm exhaust and 800cfm intake then you have 0 negative pressure and no concave. Slightly reduce the intake to something like 600cfm and you'll have your slight negative pressure without too much strain on the tent supports. Is it this simple?

 

[Snook]

Cheetos, I fight with the same stuff.. not being an ass but you might be able (I cant) to sort out your question here> https://www.icmag.com/ic/showthread.php?threadid=112862

 

[Vanilla Phoenix]

I have a 747cfm Vortex fan blowing into a 1400 cfm Can filter. It's been working for years with no smells. In my perpetual I only have one plant flowering hard at a time. They are around 2 weeks different in age, so the whole tent isn't stank! Lol. Probably why it has lasted for years. Don't really wanna say how long cause ppl on here will say I'm lying!

So my experience with having a lot bigger filter is it last a lot longer.

 

[Snook]

I have a 747cfm Vortex fan blowing into a 1400 cfm Can filter. It's been working for years with no smells. In my perpetual I only have one plant flowering hard at a time. They are around 2 weeks different in age, so the whole tent isn't stank! Lol. Probably why it has lasted for years. Don't really wanna say how long cause ppl on here will say I'm lying!

So my experience with having a lot bigger filter is it last a lot longer.

I take the animal at the watering hole attitude here, VP.. being from a not legal state, the predator (LEO) and paranoia keeps me from frequenting the local hydro store (watering hole), so your bigger is better means that I only have to expose myself there only once and then not for a long time.. tks.. Wkn'nBkn'

 

[Fly by Night]

Didn't know you could use this type fan attached to carbon whew

 

[hot cheetos]

Thanks for the input vanilla! Thats definitely good then...

Sure you could, i use the 10inch 1065 vortex on my 1400 carbon.

 

[Mr. Miyagi]

I forgot what the ratio is supposed to be... but performance IS affected if the fan and filter aren't properly matched or at least close. If the fan isn't strong enough, the odor goes around carbon without being caught, and if it's too strong, the same, the smell passes too quickly without hitting carbon.

And yes, that fan and filter is nicely sized for that tent. Passive intake will be your friend in that tent too... that way your don't cause too much of a vacuum by not having an intake, and you avoid smell leaking by having an active intake. Just my 2cents