Category: Standards & Testing
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Electrostatic Discharge (ESD) and 16890 Efficiency Test Without ESD
Synthetic filter media often relies on an electrostatic charge to reach the efficiency printed on its label. That charge fades in service. ISO 16890 deals with this by testing the filter again after the charge has been removed, and the discharged result is the number worth trusting. Below is where the charge comes from, why…
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HEPA FILTER FACTORY TESTING STANDARDS- EN 1822 AND ISO 29463
Comparison between EN 1822 and ISO 29463 Before reading this article you can find more information about the EN1822 standard here.Before reading this article you can find more information about the ISO 29463 standard here. EN 1822 and ISO 29463 are two international standards related to air filtration, specifically focusing on high-efficiency particulate air (HEPA)…
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EN1822 Standard – High Efficiency air filters (HEPA and ULPA)
EN 1822 classifies EPA, HEPA and ULPA filters by their efficiency at the most penetrating particle size (MPPS). Part 1 of the standard, EN 1822-1:2019, carries the classification table: eight classes from E10 to U17. An H13 filter has to reach 99.95% integral efficiency at MPPS, an H14 filter 99.995%. Below is the full table,…
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Understanding ISO 29463 Standard – High efficiency filters and filter media for removing particles from air
ISO 29463 is a series of international standards developed by the International Organization for Standardization (ISO) to address the testing, classification, and marking of high efficiency air filters. Published as a common language for testing and classifying high efficiency filters worldwide, including Europe and America, the ISO 29463 standard aims to harmonize and streamline filtration…
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ISO 29461: Standard for Air Intake Filters in Gas Turbines
ISO 29461 is the test standard for air intake filters on gas turbines and other rotary machinery. It now has three published parts, and the third one only arrived in 2024. Part 1 covers efficiency and dust holding capacity, Part 2 covers water, Part 3 covers whether the filter physically survives. Each part tests something…
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The MERV Rating System: What You Need to Know
MERV runs from 1 to 16 and is the North American way of rating a general ventilation filter. Each band corresponds to a particle size range the filter is expected to hold back, from coarse dust at the bottom of the scale to bacteria carriers and smoke at the top. This post covers what each…