Engineered for exterior and rooftop applications, Q Duct™ requires no additional weatherproofing or insulation. System is custom-fabricated using 2 layers of rigid UL 181 Pal phenolic core material, faced on both sides with coated aluminum and exterior multilayered laminate jacketing material. Interior and exterior layers resist mold, mildew, UV, and extreme weather conditions. Delivered preassembled to jobsite, Q Duct does not emit VOCs or toxic gases and contains no microfibers, CFCs, or HCFs.