JET Alu-Dunkelklappe WD-40

Aluminium darkening flap WD-40 dome rooflight

The darkening flap for flat roofs

The aluminium darkening flaps WD-40 are ideally suited for efficient smoke extraction in the event of fire. They are utilised in instances where daylight is not needed. The aluminium flap in a sandwich construction is thermally separated by the sturdy fan framework made of rigid PVC and insulated with 40 mm mineral wool. Therefore, it is entirely energy-efficient.

The darkening flaps can be utilised in new buildings and refurbishment projects, and adapted to individual requirements using the wide range of VELUX Commercial accessories. An optical adaptation to your project is also no problem due to the surface area in RAL colour.

The aluminium darkening flaps WD-40 are also suitable for daily ventilation. The actuation can be executed either manually, electrically or pneumatically as desired.

  • Aluminium darkening flap with 40mm mineral wool insulation
  • Surface area: Aluminium natural (optional colour according to RAL on request)
  • Fixed or ventable
  • Ventilation possibilities: manual, electric, pneumatic
  • Can be utilised as a SHEV device with the various FIREJET® opener fitting systems – tested according to DIN EN 12101-2
  • Can be utilised as a staircase SHEV device according to LBO with various 24V electric drive units and SHEV central units
  • Deliverable in nominal dimensions 60 x 60 up to 200 x 200 cm / 200 x 300 cm
  • Aluminium darkening flap
    (aluminium / A1 mineral wool / aluminium)
    (components are predominantly non-combustible)
  • Industrial buildings
  • Commercial buildings

Accessories for aluminium darkening flap WD-40 dome rooflight


Fall-Through Protection Systems

SHEV and Ventilation