Non Return Damper

Features: AV-NRD designed to prevent back draft when air moving devices are switched off.
Maximum Velocity: 3000 FPM
Maximum Differential Pressure: 1.0 kPa (4” WG)
STANDARD CONSTRCUTION:
Frame
1.2 mm thick Galvanized Steel (Also Available in 0.8mm to 1.6mm)
Blades:
0.9 mm Thick Extruded Aluminium section
Blade Seal:
Polyester Foam
Bearing:
Nylon Bush
Axle/Spindle:
8mm Galvanized Steel
Connection:
Flange
Spigot
Minimum Size:
Vertical: 4” (W) x 4” (H)
Horizontal: 4” (W) x 4” (H)
Maximum Single Section
Vertical: 48” (W) x 48” (H)
Horizontal: 48” (W) x 48” (H)