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AOV Smoke Vents

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Automatic Opening Vents (AOVs) are electrically operated smoke vent rooflights which open to reduce smoke and heat build up during building fires. An AOV will help minimise the accumulation of smoke and heat in corridoors and stairwells ensuring they remain accessible.

Em-Vents are CE marked and fully certified to BS EN12101-2 and to Building Regulations ADB and ADL.  These electrically operated smoke vent rooflights designed to reduce smoke and heat buildup in buildings in the event of fire.

Available with either glazed or solid covers, Em-Vent smoke ventilators come in a  range of shapes and sizes appropriate for various site requirements and to meet building regulation requirements of 1.0m2 or 1.5m2 free vent area.  These flat roof smoke ventilators open to 160° which exceeds the requirements of the new Smoke Vent Standard BS EN12101-2.

Em-Vents can also be used to provide comfort ventilation and as electrically operated access hatches.

Em-Vent accessories include control panels, additional smoke detectors and manual control points.


    Fully certified to EN12101-2
    Opens to 160° within 60 seconds
    Choice of polycarbonate glazing or solid insulated cover available
    Optional Wind Deflector to increase aerodynamic value (Cᵥ)
    Em-Vent Smoke Control Panel and accessories provide fully compliant control

Em-Vent Smoke Ventilators are supplied with patented high security screwbolts as standard.

Shapes & Sizes

Size range

Em-Vent Smoke Ventilators are available in an unrivalled range of over 55 sizes in square, rectangular and circular shapes. Most of these are available from stock.


The Em-Vent can be supplied with polycarbonate glazing or an insulated solid cover. The glazing element can be chosen from the wide range of options in the Em-Dome rooflight range such as single, double, triple or quad skin with a clear, opal diffused, bronze or HeatReflect finish in dome or pyramid profile. The key benefit of the polycarbonate glazing is that it allows natural light into the building. All polycarbonate glazing has an impact strength 250 times greater than glass and is AA fire rating to BS476 Part 3. Whitesales offer a 10 years warranty against discolouration and loss of impact strength.

The solid insulated cover can be provided as mill finish aluminium or polyester powder coated to any standard RAL colour.  It is available insulated with a 32mm panel or a 64mm thick panel providing exceptional thermal insulation values.