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Roof Opensky

Roof Opensky is a louvred roof ventilator in an attractive, economical low profile which has been specifically designed for both smoke and heat exhaust and natural ventilation applications.

Material and Finish

1.5mm press formed aluminium. Mill finish aluminium or powder coated to RAL colour.

Louvre Blade Options

The roof ventilator Opensky can be supplied with both insulated louvre blades and an insulated body to assist in ensuring the building is adequately insulated.

Blade pivots are 6.0mm diameter solid aluminium bearings in shouldered nylon66 brushes for maintenance free operation.

Louvre SpecificationU-Value
Single Skin Aluminium (1.5mm)6
Insulated Blades (25mm PIR)0.66
Polycarbonate Blades (2mm Translucent)1.75

Translucent polycarbonate louvre blades provide excellent daylighting using a durable UV stabilised material. When closed it can provide an average diffused light transmission in excess of 80%, enabling savings on artificial lighting. Pile weather seals are also fitted to the louvre blade edges and sides to minimise heat loss.

Control Options

The louvre blades can be released by thermal link or one of the options listed below. The relevant test standard for each option is provided.

Control OptionsTested To
24v Electric Drive Open / Drive CloseEN-12101
Electric 230v Drive Open / Drive CloseBS-7346
Electric 24v and 230v Spring ReturnBS-7346
Pneumatic Air to OpenEN-12101
Pneumatic Air to CloseEN-12101


Opensky is suitable for fixing in a wide variety of applications. The ventilator is supplied in two parts to facilitate easy installation on site, the base assembly and louvre box assembly. The base types and applications are as follows:

  • Turndown Base – mounting onto weathered roof upstand
  • Flat Base – mounting directly onto roof sheeting
  • Glazing Base – integrating into glazing systems

The Roof Opensky can also be supplied with a hinged base for use as an access hatch.

Typical Detail of Roof Opensky

Turndown Base


The roof Opensky has been tested to BS EN 12101 – Part 2: Specification for natural and heat exhaust ventilators. When closed the ventilator is weatherproof and is tested to BS 5368 Parts 1 & 2.

Wind LoadWI-1500
Temp (Low)T (-5°C)
Temp (High)B-300

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