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What are HEPA and ULPA filters?

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What are HEPA and ULPA filters?

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High Efficiency Particulate Air (HEPA) filters are 99.99% efficient in removing particles 0.3 micron and larger. HEPA filters utilize spun-hooked glass fiber rolled into a paper-like material. This material is pleated to increase the fiber surface area and bonded, or potted, into a frame. Hot melt is used to hold the pleats far enough apart to allow air to flow between them. Ultra Low Penetration Air (ULPA) filters are 99.9995% efficient in removing particles 0.12 micron and larger. Like HEPA filters, ULPA filters are made of spun-hooked glass fiber rolled into a paper-like material. Envirco’s filters meet the latest IEST Recommended Practices.

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