PRESSURE RELIEF DAMPER -F750 • -U750 Installation dimensions VF750 Application The positive (V-) and negative (N-) dampers for mounting in the wall or between two ducts are used as automatic operating dampers of air diffusers in airconditioning installations to prevent undesirable air flows. Technical information Characteristics All dimensions in mm Pressure loss = Recommended air velocities ∆ pt = Total pressure loss in Pa vf • blades with acoustic joint for return • smoothly rotating nylon bushing blades • over rotation of blades is prevented by a stop • distance blades = 75 mm • max. deflection of the blades (completely open) = 70 mm • available in steps of 25 mm, as well in length as in height min L = 200 mm, max L = 1800 mm min H = 200 mm, max H = 1800 mm • nom. L ≤ 625: no partition 650 m nom. L ≤ 1225: 1 partition 1250 m nom. L ≤ 1800: 2 partitions Construction • NF750/VF750: extruded aluminium frame, natural tone anodised; blades in aluminium sheet • NU750/VU750: galvanised steel sheet U-frame; aluminium sheet blades

Fixing GRRDR INTERNATIONAL Delivery possibilities Example: Aluminium pressure relief damper, equipped with blades with acoustic joint and rotating nylon bushings. In order to prevent the blades from over rotating, a blade stop has been provided. Type: VF750 • NF750/VF750: screw fixing in -F750 version, the screw holes have already been factory drilled • NU750/VU750: construction for mounting between two ducts; the frame has to be drilled on site • NF750: - negative pressure damper for wall fixing - with screw holes in frame • VF750: - positive pressure damper for wall fixing - with screw holes...