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Multi-mode hybrid ventilation with enhanced thermal efficiency

Ventilation specialist Passivent has introduced the Hybrid Plus2 Aircool® multi-mode ventilation system. Designed to meet the requirements of the Building Bulletin 101, “Guidelines on ventilation, thermal comfort and indoor air quality in schools” and the Facilities Output Specification for Priority Schools Programme Phase 2, the Hybrid Plus2 Aircool is suited to where a single-sided ventilation strategy is required in a building.

With a contemporary, streamlined design, the product consists of three main components: the external weather louvre, the through-wall sleeve and the inner mixing unit, making it easy to specify and order, whilst ensuring a complete integrated system is supplied. The Hybrid Plus2 Aircool incorporates three modes of operation to suit varying internal CO2 and room temperature levels. Mode 1 – mixing mode – is designed for cooler spring, autumn and winter periods when the incoming air is tempered by mixing with warmer internal air before it enters the room thus minimising the risk of cold draughts. Mode 2 – cooling mode – is used in the warmer summer months when the unit responds to the higher temperatures within the room environment, extracts the warm stale air and replaces it with cooler fresh air. This mode ensures that CO2 and temperature are kept at acceptable levels.  Mode 3 – passive mode – can be used when two units are incorporated in the same room.  This mode does not use any powered fans and allows single-sided ventilation to the room passively when mixing or cooling are not required.

Above: Passivent’s Hybrid Plus2 Aircool offers ventilation with improved thermal efficiency.

The system utilises the controllable insulated dampers from Passivent’s Aircool range which have been designed for use in external facades, including all forms of wall construction, curtain walling and window profiles. The system is controlled by the Passivent iC8000 controller allowing for up to four individual zones to be managed or it can be integrated within the building’s management system. Incorporating a variable speed fan, the unit is energy efficient and quiet but is able to deliver up to 145l/s of ventilation. Weather resistance and security are provided by the external weather louvre, even when the internal insulated louvre is open. One Hybrid Plus2 Aircool can effectively ventilate a room containing up to 16 occupants; adding a second unit will accommodate up to 32 people per room. Made from robust lightweight ABS, the unique three part construction can be mounted below the ceiling and its modular design makes it simple and fast to install. The Hybrid Plus2 Aircool can also be mounted within the ceiling void with the inclusion of additional grilles and ducting.

Above: Passivent’s Hybrid Plus2 Aircool ventilators in situ.

The ventilator can be used across a range of markets including education and commercial offices with higher internal heat gains. In addition to daytime cooling, it can also be used for night cooling to reduce the risk of overheating.

Passivent offers a comprehensive technical design service including assistance with product selection and system design.

For more information, contact 01732 850 770, email or visit

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Contact us today to discover more about our extensive range of natural and hybrid ventilation products and the technical support services we can offer.

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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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