Cfm calculation help

Sparadical

Sparadical

Well-Known Member
Hi all,

My fan packed up last night in my closet and I need a new one ASAP, only thing I want to check is of this fan will work for me. I am terrible as maths always have been so would love some help.

My space is 3x3x5 ft and I have a 5 inch cool tube and a 4 inch carbon filter will this fan be able to handle the job?

http://pages.ebay.com/link/?nav=item.view&alt=web&id=390614001918&globalID=EBAY-GB

The 5 inch version is the one I want.

Thanks all.
 
B

Budget Buds

Well-Known Member
300 cfm is on the lower end of the spectrum, those numbers are prolly without any load on the fan so if it is under load it could be 50% less or 150 ish cfm. carbon filters produce lots of load in my set up and I would not get that fan because of it, It is also 5 inches which I have never seen, all the ducting and carbon filters and air cooled hoods are 4 or 6 or 8 inches ect etc. I would shop around for something better with more flow. IMO It is better to go way bigger then you need to and get a fan speed controller
 
Sparadical

Sparadical

Well-Known Member
Haha thanks for doing the math antman and great name btw!

Budget and kiwi thanks for the input too, I want to go higher but as usual cost is the problem...

Also how do you keep a 1000w cool in a 4 inch? I put my 600w in mine and the glass got so hot it raised the temp by 10 Degrees!
 
Sparadical

Sparadical

Well-Known Member
So the 6 inch is 550 cfm and only a fiver more, I can get a duct reducer fitted or get larger duct, that's not a problem.

That should do it I reckon, I have 1x 125mm PC fan as intake and before my old fan blew it ran at 25 degrees, but that's without the filter and it's getting a bit stinky now....
 
kiwipaulie

kiwipaulie

Well-Known Member
Sparadical said:
Haha thanks for doing the math antman and great name btw!

Budget and kiwi thanks for the input too, I want to go higher but as usual cost is the problem...

Also how do you keep a 1000w cool in a 4 inch? I put my 600w in mine and the glass got so hot it raised the temp by 10 Degrees!
Click to expand...
What sort of fan have you got. Mines quite high quality and main thing is that's a centrifugal fan.
 
Sparadical

Sparadical

Well-Known Member
I just had a bathroom inline exhaust fan I picked up a year ago in a Home Depot kind of shop, it was super powerful and cheap!
 
Antman15

Antman15

Well-Known Member
Either way you may need to slow it down to let the carbon filter be effective. What is the cfm rating on the filter? If you are too much above that, you are going to be moving the air too fast through the filter for it to be able to work.
 
Sparadical

Sparadical

Well-Known Member
Balls just checked the website I purchased from says 200cfm on filter......

Quick question, I've always had the filter in the closet, going filter, ducting, cool tube, fan, ducting out into another room, can I change it so I have the filter on the end in the other room?
 
Antman15

Antman15

Well-Known Member
I've seen people push through the filter before, but I don't have an personal experience doing that. Plus any large setup I've seen is always pulling through the filter. I think they are designed to have the air pulled through not pushed
 
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