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Filtration articles
Filtration context pages for teams comparing filter media, room air cleaners, gas-phase removal, and claim-support study designs.
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Filtration
Filter ratings, gas-phase removal, room-air-cleaner claims, and performance terminology.
Filter Types & MechanismsFilter selection starts as a test-method decision, not a product-label decision. The evidence needed depends on whether the filter removes particles, gases, vapors, or a combined challenge, and whether the sample is media, a filter element, or a complete air-cleaning device.Gas-Phase / VOC FiltrationGas-phase and VOC filtration requires a different test strategy than particle filtration. The right approach depends on the target gas, media chemistry, device geometry, airflow, humidity, and whether the claim concerns removal, capacity, CADR, or by-product control.HEPA vs. ULPA FiltersHEPA and ULPA are not interchangeable labels. For cleanrooms, semiconductor wafer manufacturing, and high-efficiency air-treatment devices, the practical question is what particle-size range, airflow, fixture, pressure drop, and acceptance endpoint the test measures.MERV Ratings ExplainedMERV is useful shorthand for HVAC filter performance, but it is not the whole test result. A defensible filtration plan still has to name the standard, particle-size range, airflow, pressure drop, sample configuration, and whether the claim needs work below the MERV particle band.