View GLV International Ltd. on TEKEN44The product page for the AF-121 insulated acoustic flexible duct mentions the standard number "M1" in the technical data section, indicating the product's classification.
Description
SONOAIR; Material: Aluminum; Class: M1; Working Temperature: -30°C to +125°C; Maximum Pressure: 3000 PA; Maximum Air Velocity: 30 m/s; Insulation Color: Red, Brown, Yellow, White.
Applicable Standards
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