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

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