Tag Archive for: Natural Ventilation

Passivent’s Aircool range provides a breath of fresh air

Passivent’s comprehensive range of Aircool® wall and window ventilators offers solutions across a wide variety of sectors, providing controlled air intake and extract in natural ventilation systems to create healthy internal environments.

The Passivent Aircool range comprises four core products to give specifiers the full spectrum of solutions and meet the individual requirements of any project. Primarily suited for external installation, the Aircool is designed to work with all forms of wall construction, curtain walling and window profiles with the external weather louvre providing excellent weather protection and an insulated internal damper which minimises heat loss.

Passivent Aircool is designed to be a highly flexible product which can form part of a natural or mechanical ventilation strategy and with its electrically-actuated low-voltage dampers, it is virtually silent in operation. It is particularly suitable for use as part of a night cooling strategy, where daytime heat build-up is dissipated from the structure via the Aircool during the night, producing lower internal air temperatures with a reduced need for daytime cooling or air conditioning.  As well as the standard Passivent Aircool option, Passivent also offers an Acoustic Aircool® Ventilator with additional acoustic attenuation features plus its Thermal Aircool® Ventilator with a heater coil to temper the temperature of the fresh incoming air during cooler weather. The hybrid air-mixing variant – Hybrid Plus2 Aircool – combines the features of the Aircool with an innovative air tempering and mixing unit. It has three distinct operating modes to satisfy cool and warm conditions – passive, cooling and mixing.  Designed primarily for use in a single-sided ventilation strategy, the Hybrid Plus2 Aircool meets Building Bulletins 101 and 93 for use in the education sector, but is equally suited to general commercial applications. Building Bulletin 101 is ‘Guidelines on ventilation, thermal comfort and indoor air quality in schools’ and Building Bulletin 93 is ‘Acoustic design of schools: performance standards.’

The whole range is manufactured by Passivent to ISO 9001, and has been rigorously tested to ensure it provides superior thermal insulation and excellent airtightness as well as meeting weather resistance requirements. It is also suitable for modular construction making it a great all round ventilation solution.  Passivent’s experienced technical team is on hand to help match the right Aircool with the specific requirements of each project as well as providing support with bulk airflow calculations or thermal modelling.

All products within the Passivent Aircool  range are also available as BIM objects for ease of specification.

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Passivent delivers natural ventilation strategy for Sunderland SEND school

Leading natural and hybrid ventilation solutions manufacturer Passivent recently played its part in the creation of a specialist school located in Sunderland, providing a comprehensive range of its high-performance natural ventilation products, tailored for the SEND environment with the whole building in mind.

Passivent provided Sunningdale School with its unique thermal acoustic Aircool® window ventilators, Litevent Airstract® rooflight/ventilators and Airscoop® roof ventilation terminals which were used throughout the school in classrooms, corridors and halls.  Working closely with Sunderland City Council at the early design stage, Passivent proposed the use of a natural ventilation strategy which would not only provide effective cross ventilation in the classrooms but one which would also reduce noise pollution during operation – a critical consideration for a SEND environment.  By utilising natural ventilation, the school will also benefit from reduced energy usage without the need for mechanical fans.
Two of Passivent’s thermal acoustic window Aircool units were installed vertically in each classroom for the fresh air intake. These units allow the incoming air to be warmed via heater coils, with acoustic baffles helping to minimise the noise. The used air is then exhausted at the back of the classroom at a slightly higher level through the two standard window Aircool units installed horizontally.

A number of Litevent Airstract rooflight/ventilators were also specified and installed along the school’s corridors, with the roof lights providing a great source of natural daylight and the Airstract terminal function in this combined unit providing controllable natural ventilation. Passivent’s Litevent system reduces the need for artificial lighting thereby reducing further energy consumption.  Installed in both the dining and main hall are multiple Airscoop roof ventilation terminals which ventilate the large open spaces, providing fresh air whilst displacing any stale used air. The Airscoop has an optimised segmented design that delivers maximum airflow capacity and its patented double bank louvres provide Class A 100% rain rejection so that the building can be fully ventilated regardless of weather conditions.

To easily control the entire ventilation system, which is split into 21 zones, Passivent’s iC8000 Controller has been installed with seven panels in four different locations across the school. These will be used to modulate the natural ventilation system, monitoring carbon dioxide levels as well as internal and external temperatures to ensure an optimal learning environment at all times.  Sunningdale School is the only school of its kind in Sunderland, specialising in teaching children with severe and multiple learning difficulties aged between 2 and 11. The £13.3 million new build, which was designed with specialist therapy provisions including nine sensory rooms, opened its doors in September 2022 as part of Sunderland City Council’s £45 million programme to update schools that deliver life-changing facilities for young people.

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