Case study: retrofit of Fairfield Halls theatre

Fairfield Halls theatre in Croydon is a prime example of 1960s public architecture, so when Max Fordham was asked to devise a services strategy during a major refurbishment, it had to stay faithful to the original while maintaining 21st-century comfort and efficiency. Andy Pearson reports

Understanding Hepa filters

An appropriately specified Hepa filter can be used in mechanically ventilated spaces and recirculating systems to practically remove small airborne particulates. CIBSE Journal technical editor Tim Dwyer looks at what must be considered when integrating them into HVAC systems

Calculating Covid-19 risk according to activity and indoor space

A group of UK researchers has attempted to quantify the transmission risk of airborne Covid-19 infection according to activity and type of indoor space. Chris Iddon describes the methodology and how the risk of infection falls as ventilation rates are increased

Safe return: making school air conditioning Covid-secure

As children across the UK return to the classroom, schools have had to devise Covid-secure services strategies to safeguard pupils and staff. Chris Baker details the plan for safe air conditioning at Parrs Wood High School