
The AF-800 product page mentions the UL2158A standard number.
RIGIFLEX 5 layer aluminum foil Clothes Dryer transition Semi Rigid Duct – UL2158A listed. Constructed with multiple layers of pure Aluminum tape formed into a flexible semi rigid duct with a maximum wire pitch of 25mm, using a premium heat cured fire retardant adhesive. Suitable for temperatures ranging from -30°C to +250°C, with a maximum pressure of 3000 PA and maximum air velocity of 30 m/s.
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