The rate at which air flows through a fabric. Also referred to as BREATHABILITY. Often measured in cfm (cubic feet per minute per square foot) or cm3/sec/cm2.
References for this information:
Nanotechnology in Textiles, 2019, Pages 311-353
Solid-Liquid Filtration, 2015, Pages 1-20
Handbook of Nonwoven Filter Media, 2007, Pages 245-290