The outside of fiberboards includes a foil covering that serves as both an air and moisture barrier. By themselves, fiberboard ducts are superb insulators and don't involve any more insulation. This chemical resistance helps make PVC ducting pipes ideal for industries which include chemical processing, wastewater cure, laboratories, and mining, https://puductingtdi27047.yourkwikimage.com/1524717/top_latest_five_pu_ducting_tdi_urban_news