View GLV International Ltd. on TEKEN44The AF-830 product page mentions the standard number "M1- CSTB" under the "Class" section in the technical data.
Description
Non-insulated flexible duct made of aluminum, classified as M1-CSTB, supported by a bronze-coated wire helix. Designed for temperatures between -30°C and +250°C, with a maximum pressure of 3000 PA and maximum air velocity of 30 m/s.
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