* Underground Application * System can be air tested to 2" water column pressure * Easy to Assemble - Saves Time and Labor Cost * Energy efficiency exceeds PVC wrapped in R-10 insulation * Code Compliant 2006 IMC * Air & Water Tight Seal * Mold & Mildew Resistant * Self-Insulated Duct * UL Recognized Material * Environmentally Friendly -- Recyclable, Non-Corrosive, Non-Poisonous * Residential and Commercial Applications