ISO 29463-4:2011

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ISO 29463-4:2011, titled "High-efficiency filters and filter media for removing particles in air — Part 4: Test method for determining leakage of filter elements — Scan method," specifies the "scan method" for detecting leaks in high-efficiency particulate air (HEPA) and ultra-low penetration air (ULPA) filters. This method is considered the reference procedure for assessing filter element leakage