phenolic foam air ducting sheet is fireproofing (Class 1, BS476 part 6&7), standard sheet size, 4m*1.2m*20mm phenolic foam air ducting sheet is new generation environmental insulation material, when it is burnt, it has no smoke, it gives out non-toxic matter, the material is fire-resistance, insulated, water and moister resistant anticorrosion, anti-aging, sound insulation and energy saving, ...