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Phenolic Foam Embossed Alu Foil Air Duct Insulation Board. Superior Fire Safety: A2 fireproof rating with >1.5h fire resistance and non-toxic smoke density. Excellent Thermal Insulation: Low thermal conductivity of 0.019-0.02 W(mK) and high thermal resistance. Multiple Thickness Options: Available in conventional thicknesses of 20mm, 25mm, and 30mm. Fast Delivery: Lead time within 15 workdays for both peak and off-peak seasons. Certified Quality: ISO and SGS certified with 1-year warranty coverage.