Passivent specialises in delivering natural ventilation solutions and is active in the UK in the field of sustainable and energy-efficient ventilation for commercial buildings. The aim of Passivent is to develop innovative products and systems to provide optimum performance in all types of buildings.

A range of natural daylighting products, including tubular rooflights, modular rooflights and combined rooflight/ventilators, complements Passivent's natural ventilation range. Low-energy natural ventilation is an increasingly important design strategy for commercial buildings. Air is moved primarily by natural forces of wind and convection, so little or no power is consumed. In comparison with air conditioning or mechanical ventilation it can bring savings in capital equipment and running costs, with reduced energy use and CO₂ emissions, whilst providing controlled, comfortable conditions for users. The use of natural daylighting adds to these benefits.

Passivent has an in-house design team that can provide a comprehensive service tailored to specific schemes, covering project appraisal, computer modelling and calculations, system design, product selection and budgeting. Passivent has developed advanced software providing an integrated design approach to achieving optimum performance and rapid evaluation of proposals at an early stage. Environmental modelling is a new and invaluable tool providing detailed computer analysis of the internal environment with predictions of temperature, airflow, CO₂ concentrations and daylight levels. Combining natural daylighting with natural ventilation strategies can considerably reduce energy consumption, making a significant contribution to sustainable building design. Passivent products are designed, developed and manufactured under a BS EN ISO 9001 quality management system, giving an independently audited assurance that the products will fulfil their intended purpose.

Target audience: Architects and Mechanical and Electrical Consultant Engineers. Passivent recommends that clients, developers and building designers should consult Passivent as early as possible in the design process.