NRD is a gravitational aluminum grille for overpressure with normally closed movable blades.
The grille is recommended for wall or end mounting of rectangular duct.
The product can be used for introducing or evacuating air.
The grille has movable blades parallel to the “L” (length) and mounting holes.
The opening direction of the blades is towards the outside of the frame according to the image.
On request, the blades can be positioned in the opposite direction.
The grille blades open at overpressure.
For lengths > 500 mm, the grille is provided with elements for stiffening.
The grille contains load-bearing sections made of anti-friction plastic and a gasket positioned along the length of the blades.
The product is delivered with fixing screws.
Dimensional limits: minimum dimensions 200×200 mm, the maximum built surface is 1 sqm with the condition H max = 1 m.