What Are CFM's?

[Meaple]

Exactly what it says in the title. I understand that it is something to do with airflow or something, I don't know. If so, what is a rate and bad rate. Also, how many decibels are like really quiet for a fan?

Thank you in advance.

 

[hmmblah]

CFM means Cubic Feet per Minute. Essentially, how much air the fan can push in a minute.

 

[Lorem-Ipsum]

As for your second question anything under about 22 Db is pretty much silent.

 

[Meaple]

What is a good and excellent CFM rate?

Thanks for the help guys

 

[lasher]

Its CFM in relation to DB you need

High CFM low Db. - Not usually used in same sentence ofc.

Something like these are good

http://www.noctua.at/main.php?show=productview&products_id=12&lng=en&set=1

 

[Stryker64]

CFM is many cubic feet of air it pushes in a minute so higher is better. For fans I would say 20dB or below it what I consider to be silent, that's roughly the same volume as a mosquito flying around. 30 dB is probably the highest I would go, which is the same as someone whispering.

When it comes to choosing CFM I would say for 120mm 50+ CFM is good, but you would also need to consider static pressure. Just be careful when buying fans because manufactures have a tendency to put in the max CFM and the minimum dB of their fans,

 

[murphy7801]

CFM is many cubic feet of air it pushes in a minute so higher is better. For fans I would say 20dB or below it what I consider to be silent, that's roughly the same volume as a mosquito flying around. 30 dB is probably the highest I would go, which is the same as someone whispering.

When it comes to choosing CFM I would say for 120mm 50+ CFM is good, but you would also need to consider static pressure. Just be careful when buying fans because manufactures have a tendency to put in the max CFM and the minimum dB of their fans,

If you look you can find some good 120mm fans which sub 20db and 60cfm for example

http://specialtech.co.uk/spshop/customer/product.php?productid=9387&cat=1535&page=1

I recently bought couple these for my case and I was not disappointed

 

[Meaple]

Lovely. Thank you guys for all the help. Hope this helps anyone else as well

Have a great new year guys.

 

[lucas4]

just been reading through this, and just wanted to say thanks also! learnt lots about fans and will help me with future purchases

!