Blocking the opening of the cable tray

For large openings, install a fire-resistant backing plate before sealing. Layout and positioning must be reasonable to facilitate installation and maintenance. Choose appropriate fire protection materials, such as fire-rated board, firestop packs, firestop mastic, or. This product will intumesce and lock tightly into place eliminating the prep work of cutting or leaving any messy debris. The resulting barrier retards the transmission of smoke, fire, and toxic gases from spreading between adjacent rooms and floors for the rated time period. Where cables pass through shafts, walls, slabs, or enter electrical panels or cabinets, openings shall be tightly sealed with firestopping materials in a...