Ductwork units extracting fine powders or chemical solvents are viewed as to get a heightened fire hazard. Why pick out ROCKWOOL remedies? ROCKWOOL options for ductwork fire resilience are already developed and tested based on the most current European protection standards2. They are really all classified as A1 non-combustible – https://donovanjevn54219.blogdigy.com/cibse-for-dummies-43217031