Ceiling Fan CFM

[texanman]

Hi,
I am having a hard time finding the published CFM from typical ceiling fans (commercial or residential). It seems that the manufacturers don't particularly emphasise the cfm on these products.
thanks,

 

[lownox]

That is likely because they are primarily used for circulating the air within a room. For what reason do you seek this information? Just curious...

 

[texanman]

The information is needed to determine air flow velocity. I am looking at comfort criteria for people vs air movement.
thanks for asking.

 

[willard3]

This may or may not help as there is no relation to fan size here. This is a cut-and -paste from the web.

ENERGY STAR specification defines residential ceiling fan airflow efficiency on a performance basis: Cubic Feet per Minute (CFM) of airflow per Watt of power consumed by the motor and controls. Efficiency is measured on each of three speeds.


* At low speed, fans must have a minimum airflow of 1,250 CFM and an efficiency of 155 CFM/Watt.
* At medium speed, fans must have a minimum airflow of 2,500 CFM (3,000 CFM by October 1, 2003) and an efficiency of 110 CFM/Watt (100 CFM/Watt by Oct. 1, 2003).
* At high speed, fans must have a minimum airflow of 5,000 CFM and an efficiency of 75 CFM/Watt.

 

[mtcone]

Do larger ceiling fans generally use more power, while moving more air?

 

[KiwiMace]

Bigger non-residential fans typically have better efficiencies from aerofoil blades etc.

Looking at the big ass fan catalog: 225 W/cfm based on the motor size of the 24' fan, not the absorbed power.

Looking down the size chart, I think that this might be one of the better operating ranges however. Still, a significant improvement over the energy star figures.

 

[KiwiMace]

Forgot my ref:

http://www.bigassfans.com/pdf/PowerfoilMiniCatalog.pdf