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The UK's Leading Supplier of Rooflights
Automatic Opening Vents (AOV)

Automatic Opening Vents (AOVs) and Smoke Vents


Smoke vents and automatic opening vents (AOVs) are designed to reduce smoke build-up in the event of a fire, helping to provide a safer escape route and improve safety.Our systems are fully compliant with BS EN 12101-2 regulations for natural smoke and heat exhaust ventilation, and they can also be used to create more natural light. We have systems available for both commercial and residential properties.


Browse the various brands we supply and find the ideal smoke vent options for your property.

Smoke Vent Brands


Thermadome smoke vents

Polycarbonate or solid lid smoke vents for any budget. Thermadome smoke vents open to 160° and can also be used to provide natural ventilation. A typical smoke ventilation system includes Therma-Vent smoke ventilator (AOVs) located at the highest point of an escape route staircase or at the top of a smoke shaft. Smoke detectors and manual control points are normally located on each floor. The system can be controlled by a Therma-Vent control panel.

Locations & Features:

Single Leaf

Double Leaf

Roof Louvre

Solid Blade

Shaft Vent Door




Stardome smoke vents

Stardome polycarbonate smoke vents are the ideal choice for projects where space is limited; bespoke sizes and configurations are available with short lead times.Designed to reduce smoke build-up, helping to provide a safer escape route for occupants and access for fire-fighting personnel.


  • • Fully certified to BS EN12101-2
  • • Concealed actuators
  • • Thermally broken aluminium framework
  • • Can be powder coated to most standard RAL colours
  • • Huge range of bespoke configurations available
  • • Can be tailored to suit varying depths of insulation either above or below the roof

See below our varied range of glass aluminium framed rooflights.





Starglaze smoke vents

Glass smoke vents available in a range of standard and bespoke sizes. These attractive smoke vents feature a flat glass profile, with double glazing as standard.


  • • Fully certified to BS EN 12101-2
  • • Flat glass profile – Double glazed as standard
  • • Concealed actuators
  • • Thermally broken aluminium framework
  • • Can be powder coated to most standard RAL colours
  • • Huge range of bespoke configurations available
  • Can be tailored to suit varying depths of insulation either above or below the roof




Lunaglaze single leaf glass smoke vents are characterised by unique retractable arms that move with a scissor-like action, opening up a large ventilation area in just 60 seconds.


  • • Fully certified to BS EN12101-2
  • • Unique retractable scissor-action opening mechanism
  • • Unobstructed clear smoke ventilation
  • • Choice of clear or diffused glazing
  • • Flush design for efficient drainage



Astroglaze automatic opening vents are premium flat glass units that provide natural heat ventilation. They can be used in both commercial and residential settings.


  • • Fully Certified to BS EN 12101-2
  • • Premium Quality Design
  • • Available in Multiple Sizes
  • • Removable Motor Housing Cover
  • • 6A Control Panel




We are suppliers of the Coxdome Jet Cox FireJet range from one of the leading industry names. These smoke ventilation systems are suitable for commercial and residential applications. FireJet roof smoke vents not only help to provide smoke extraction in the event of a fire but they also provide day-to-day controllable ventilation. Available in a wide range of sizes (many of which are held in stock) the Jet Cox FireJet range complies with the latest Building Regulations on Fire Safety and can be integrated into any Building Management System.



Mardome Trade Smoke Vent Rooflights

The highly advanced Mardome Trade Smoke Vent rooflight range is designed for safety and comfort. Polycarbonate Automatic Opening Vent rooflight for smoke ventilation Available in Clear textured or White Opal Diffused finishes. Special features include:

  • Available in a wide variety of sizes - Standard sizes for fast leadtimes
  • 300mm PVC kerb for direct to roof fitting
  • Fully certified in accordance to BS EN 12101-2
  • Optional wind deflectors available for improved aerodynamic performance





Building regulations compliance

In England and Wales, Part B of building regulations covers fire, and Approved Document B (AD B) Volume 2 provides guidance applicable to flats and non-dwellings.

Other national regulatory guidelines might be in place, and have similar requirements. Examples include Section 2 of the Scottish Building Standards Agency Technical Handbooks 2007, Technical Booklet E of building regulations (Northern Ireland), and Technical Guidance Document B of the Government of Ireland Building Regulations 2006.

In several cases, AD B specifies the minimum level of ventilation that’s required – generally either 1m² or 1.5m².

AD B identifies some locations where it’s appropriate to install an AOV for natural ventilation, including:

  • • Small single-stair blocks of flats
  • • Common escape routes in larger blocks of flats
  • • Basement areas
  • • Enclosed car parks
  • • Vertical smoke shafts as part of a smoke control design

This is by no means exhaustive, and other regulations may be applicable to your building or industry. Please talk to us if you’d like any further information.

Contact the National Domelight Company to discuss smoke vents and AOVs, or to get a quote. Call 01276 451555, e-mail or contact us online.

If you would like assistance at any time about any of the rooflights or would like further details of our range, then please do not hesitate to contact us on 01276 451555, e-mail us at or use this e-mail form to contact us.