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QUALITY INDICATOR- FABRIC AIR PERMEABILITY
what is air permeability?
Air permeability is the volume of air that can pass through a given area of fabric at a given pressure. This quality indicator is used to determine “down proofness” of fabric.
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Cotton fabrics between 2 – 8 cfm are often considered “down proof”
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Air permeability is especially important in hospitality and on any products that are compressed or vacuum packed.
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hospitality rooms can't be covered with down and feather fiber that leaks through the fabric surface
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vacuum packing certain products can draw fibers through the fabric during transit
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measuring and testing air permeability
A fabric samples is clamped over a test chamber in an air permeability testing device (at right)
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a fan is adjusted to bring the differential pressure to a set point (for calibration).
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the pressure reading is then recorded.
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this is repeated multiple times randomly across the fabric and the final value (in CFM typically) is the average of all readings.
