The Envirograf AVG/F fireproof ventilation grille offers up to 60 minutes protection plus sound absorption. It can be used on partition walls and doors and has been tested to European Standards and approved in accordance with the general principles of NEN6069.
It comprises of two parts, one each side of the opening, and the internal cavity of both sections is filled with micro-acoustic material, with intumescent strips on the two long sides of the risk side opening.
To accommodate the grille, the ventilation aperture must be at least 10mm larger than the height between the upper and lower opposing slot limits. The grille protrudes from the door by 25mm on each side.