fire dampers Belgium

... expressed in terms of hours of fire resistance (for example, ⅓, ¾, 1, 1½, 2, 3, 4 hours). A certification list provides the limits of the rating. Passive fire protection systems generally do not require movement. The exceptions are fire dampers (fire closures in air ducts, excluding grease ducts) and fire door closers, which move, open, and close to operate, as well as all intumescent products...