Both equally tests are necessary to stop flammable grease from either catching fire when it passes by means of an adjacent space or, if the grease itself is now alight, resulting in a fire to start out inside the adjacent region by radiant heat. Stone wool insulation is fire resilient https://fireresistingductworkinsu79123.activosblog.com/35665069/the-single-best-strategy-to-use-for-fire-resisting-ductwork-insulation