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Airstract® Roof Ventilation Terminal

Passivent Airstract® is a range of roof mounted natural ventilation terminals which combine low airflow resistance with high airflow capacity and excellent weatherability. They can be used as part of a sustainable, low energy natural ventilation strategy to provide an exhaust outlet for used air. Used for passive stack ventilation applications in conjunction with Passivent Aircool façade ventilators, they can ventilate deep plan spaces and provide night cooling. They can also be used for multiple extract applications and mechanical extract outlets.

Other options include the Airstract iAT with intelligent airflow technology for still, windless days, and unusual events such as high occupancy levels or unusual heats gains.  An aluminium version is also available which offers a larger size range than the standard Airstract. The Hybrid Airstract Terminal offers  a system of ventilation provision or extraction with three modes of use depending on the needs of the building and outside conditions.  

Features and benefits

  • Harnesses the natural forces of wind, convection and buoyancy for energy saving ventilation.
  • Suitable for flat and pitched roofs of all material types.
  • Robust two-part construction including structural sub-base unit to guarantee wind load resistant design.
  • Square, rectangular and circular terminals available in a range of sizes and designs.
  • Motorised base dampers control airflow with excellent thermal and airtightness performance when closed.
  • Patented double bank louvres provide Class A 100% certified rain rejection (BS EN 13030:2001) so that your building can be fully ventilated regardless of weather conditions. 
  • Resistant to continuous wind loads at 51 m/s (BRE tested).
  • 4mm insect screen to prevent ingress of insects and other debris.



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Passivent is a division of Building Product Design Ltd.

Other subsidiaries include Glidevale Protect, a specialist in ventilation solutions, condensation control and energy efficiency across the built environment and Kingfisher Louvres, manufacturer of aluminium louvre systems.

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