Listing ID #1448182
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Contact SupplierHepa is a type of air filter. Filters meeting the HEPA standard have many applications, including use in medical facilities, automobiles, aircraft, and homes. HEPA filters are composed of a mat of randomly arranged fibres. The fibres are typically composed of fiberglass and possess diameters between 0.5 and 2.0 micrometers. Key factors affecting function are fibre diameter, filter thickness, and face velocity. The air space between HEPA filter fibres is much greater than 0.3 μm. The common assumption that a HEPA filter acts like a sieve where particles smaller than the largest opening can pass through is incorrect. Unlike membrane filters at this pore size, where particles as wide as the largest opening or distance between fibres cannot pass in between them at all, HEPA filters are designed to target much smaller pollutants and particles. These particles are trapped (they stick to a fibre) through a combination of the following three mechanisms :
Interception, where particles following a line of flow in the air stream come within one radius of a fibre and adhere to it. Impaction, where larger particles are unable to avoid fibres by following the curving contours of the air stream and are forced to embed in one of them directly; this effect increases with diminishing fibre separation and higher air flow velocity.
HEPA class | Retention (total) | Retention (local) |
---|---|---|
E10 | > 85% | --- |
E11 | > 95% | --- |
E12 | > 99.5% | --- |
H13 | > 99.95% | > 99.75% |
H14 | > 99.995% | > 99.975% |
U15 | > 99.9995% | > 99.9975% |
U16 | > 99.99995% | > 99.99975% |
U17 | > 99.999995% | > 99.9999% |