Fire-resistant board for ventilation ducts Made from metal, non-metallic sheets, or other non-combustible materials. Non-metallic materials typically include rigid PVC and glass-fiber-reinforced plastics, while metallic materials are generally galvanized steel sheets. In addition, ducts composed of a non-combustible outer layer and an insulating material inner layer are called composite ducts. There are many types of composite ducts with different configurations; however, the choice of composite duct materials varies depending on the specific environmental conditions and the required fire-resistance ratings for ventilation systems. Below, we will introduce the fire-performance characteristics and rating requirements of various fire-resistant duct boards, as well as methods for distinguishing product quality:

　　I. Fire Performance and Grade Requirements for Fire-Resistant Boards Used in Ventilation Ducts

　　1. Glass fiber ducts have fire-resistant performance and meet fire-rating standards.

　　Centrifugal cotton itself has a fire resistance rating of Standard Class A, with a typical fire-resistance limit of around three hours. Its fire-resistance testing typically takes about two hours. Moreover, the strength of glass-fiber double-sided composite reinforced foil is enhanced, and the fire resistance of the foil itself is also improved; therefore, glass-fiber composite duct insulation boards also boast excellent fire-resistant performance.

　　2. Fire performance and classification of glass-magnesium composite ducts

　　The glass-magnesium composite duct is made of inorganic glass fiber-reinforced plastic oxidized on both sides, with magnesium oxide and magnesium chloride as its primary components. The inorganic glass fiber-reinforced plastic exhibits excellent corrosion resistance and fire resistance, making it highly suitable for use in composite duct panels. Under normal circumstances, the fire-resistance rating of inorganic glass fiber-reinforced plastic–glass-magnesium composite ducts can exceed two hours, meeting the Class A fire-resistance standard specified in fire detection tests.

　　3. Fire performance and fire rating of phenolic composite ducts

　　The phenolic foam core itself is a flame-retardant material. In fire detection tests, phenolic foam exhibits fire resistance lasting from over one and a half hours to under two hours, meeting the B1 fire protection requirements stipulated in fire detection standards. The fire performance test limits for color-coated steel composite phenolic insulation boards can effectively satisfy the requirements of the A1 fire protection standard.

　　II. Distinguish Fire-resistant board for ventilation ducts Methods for product quality

　　1. The product is fire-resistant, flame-retardant, and non-combustible—Class A1. It complies with national standards.

　　2. Waterproof and moisture-resistant. After being immersed in water for more than 48 hours, the board will not deform or change.

　　3. The fire-resistant panels for ventilation ducts are corrosion-resistant and acid- and alkali-resistant, ensuring the durability of architectural decorations.

　　4. Sound and heat insulation: The entire panel boasts excellent thermal insulation performance and soundproofing effects; it features a low coefficient of thermal expansion and a low moisture absorption and deformation rate.

　　5. Lightweight and high in strength—thanks to its strength advantage, it can be constructed using thin sheets, resulting in an overall lightweight building.

　　6. Low transportation and construction losses. The material can be freely cut on-site using machinery to meet the requirements of walls and ceilings of various sizes. It is easy to work with, saw, plane, nail, and glue.

　　7. The surface’s smoothness and adhesion ensure ease of surface treatment. The surface can be coated, laid flat, or wallpapered with other decorative materials.

　　8. The product offers high cost performance and has low integration platform costs.

　　Since fire-resistant panels for ventilation ducts are generally used in architectural decoration, they ensure excellent fire resistance and a long service life—up to 40 years—and deliver outstanding performance.