View GLV International Ltd. on TEKEN44The AF-113 product page mentions the following standards and certifications: - **M1**: This classification indicates the fire performance of the duct material. - **UL181**: This standard pertains to factory-made air ducts and air connectors, as certified by UL. ([glv1995.com](https://glv1995.com/wp-content/uploads/2022/09/UL181.pdf?utm_source=openai)) These references are found on the product page and the company's quality and certificates page. ([glv1995.com](https://glv1995.com/product/af-113/?utm_source=openai))
Insulated 4-layer core, 3-layer jacket; Material: Polyester; Working Temperature: -30°C to +125°C; Maximum Pressure: 3000 PA; Maximum Air Velocity: 30 m/s; Insulation Color: Red, Brown, Yellow, White.
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