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

Clear guidance: TR40 Best practice for exhaust ventilation

The risk of death and illness because of exposure to hazardous substances in the workplace can be cut by following the best practice guidance in ILEVE and BESA’s new TR40 publication. Alex Smith summarises the guidance aimed at the safe design and installation of local exhaust ventilation

Measuring overheating

To minimise overheating in homes it is important to produce accurate models to understand where risks might lie. To test the accuracy of modellers’ predictions, researchers – led by Ben Roberts – compared four models with real-life temperatures in two homes

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

Quality assured: regulating the heat network industry

With investment in heat networks expected to rise exponentially, the government is proposing mandatory testing to ensure the new wave of low carbon district heating delivers performance and value for consumers. Alex Smith reports