Double flap vent suitable for all-weather ventilation of warm air and/or smoke from a building within a short period of time, daily ventilation and natural lightning.

Product Features

 It is equipped with lateral inner flaps to enable weather-protected ventilation. As soon as the outer flaps close due to rain, the inner flaps open. The flaps are closed by a spring mechanism. The changeover from fair-weather ventilation to weather-protected ventilation is controlled by a rain-sensor system. Suitable for utilization on various kerbs and domes. The vents are manufactured according to ISO 9001 quality control standards and comply with the European requirements for NSHE according to EN 12101-2. Endurance tests with 10,000 opening and closing cycles have proven its robust and functional design. The vents are formed from high quality corrosion resistant aluminium to ensure low maintenance requirements and water tightness. 

Various methods of operation using pneumatic or electric actuators are available. Available on large dimensions, up to 1900 x 3000 mm (width x length). 

Tempered Alumininum


Opening 140º,150º & 160º



RAL 9005

Tempered Glass



Typical Applications

Can be installed either into roofs or barrel vault daylighting systems (flat roofs, skylights and northlight roofs). Particularly suitable for warehouses, logistics centres, production environments and industries. 


Tempered aluminium, sea water and corrosion resistant (EN AW 5754). 
Corrosion resistant bearings. 
Sealant applied so that there is no freezing, enabling the equipment to have low air permeability at the same time. 

Note: aluminum is supplied untreated as standard. Possibility of being supplied with electrostatic painting (in any RAL color). 


Roof opening width: 1000 – 1900 mm. 
Roof opening length: 1000 – 3000 mm. 

Opening Angle

Open angle from to 90º

Controls Fire Ventilation

P2F: double pipe compressed air operation with fire function. 
M24V: electric motor

Controls Natural Ventilation

P1: Compressed air ipening and spring closing.
M24V:  electric motor.
M230V: electric motor.


Single aluminium. 
Double wall aluminium with insulation. 
Double wall aluminium with insulation and TB, thermal break in the aluminium base. 

Note: other non-standard bases available upon request 


Depends on dimensions and type of infill.


AL – Single Aluminium.
AL ISO – Double insulated aluminium (20 and 50 mm).
PC16 – Polycarbonate 16 mm, clear or opal. 
PC25 – Polycarbonate 25 mm, clear or opal. 
PC32 – Polycarbonate 32 mm, clear or opal. 
TB – Thermal break in the aluminium profiles. (Available for flaps of AL ISO, PC25 mm, PC32 mm). 



The system has been tested and certified in accordance with EN 12101-2.

Tested in accordance with the Directive 2014/34/EU, MEGADELTA is ATEX certified equipment.


Custom Dimensions;
Powder coated design (any RAL color);
Bird or insect mesh/Anti-fall grid 1200 J.