A passive fire defense solution for air distribution programs, smoke Command and kitchen grease ducts Promat has designed self-supporting programs without a steel liner, for example PROMATECT®-Advert, PROMATECT®-L500 and MASTERBOARD®, which might match the leakage and air movement overall performance of steel ducts both equally for air ducts and smoke https://grease-tight-extract-duct01223.pointblog.net/considerations-to-know-about-grease-tight-extract-ductwork-83637225