A passive fire protection Alternative for air distribution devices, smoke Manage and kitchen grease ducts Promat has developed self-supporting programs and not using a metal liner, for example PROMATECT®-Advert, PROMATECT®-L500 and MASTERBOARD®, which can match the leakage and air flow performance of metal ducts both equally for air ducts and https://greasetightextractductwor78900.verybigblog.com/35930160/helping-the-others-realize-the-advantages-of-fire-resisting-ductwork-insulation