Composed of frame and horizontal blade assembly, manufactured from high quality extruded aluminium profiles with the advantages
of corrosion resistance and rigidity. Blades are fixed rigidly to the main frame by rivets. Blades are set at an angle of 45
degree to the horizontal with 40 mm spacing. Louver is fixed with an opposed blade damper to ensure positive control over the
flow of fresh airstream. Damper blades can be operated manually by a projected lever. Total structure is weather proofed and
blades are inclined down ward to protect against rain water. Structure provides around 45% effective pressure area.