CFM | Definition

Pronunciation:

Acronym for Cubic Feet per Minute 

Definition: 

CFM is  a measure of wind permeability  ain fabric. 0 CFM is complete wind proofness. 

Here’s an outline for the practical application of these numbers:

• 60 CMF – about what an average fleece material is rated; the wind will go right through this.
• 20 CFM – wind-resistant.
• 10 to 5 CFM – very wind-resistant; what most softshells are rated.
• 1 CFM or less – considered windproof.
• 0 CFM – completely windproof; no wind at all will get through and therefore you will experience no convective heat loss.

Resource: 

https://blog.jans.com/an-explanation-of-technical-clothing-ratings/

Glossary Category:

Testing