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See Chinese contents: QC/T 1133-2020 QC/T 1133-2020: Commercial vehicles air filter safety element
This document specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, storage of safety elements of commercial vehicle air filters. This document is applicable to safety elements of commercial vehicle air filters (hereinafter referred to as filter elements), which have a volume flow of less than 4000 m3/h. For the safety elements of air filters for construction machinery, agricultural and forestry machinery, ships and stationary power, they may refer to this document.
