The authors of CIBSE's Natural ventilation guide discuss the best practice for minimising the risk of the virus as we emerge from lockdown Minimising the risk of Covid-19 in the built environment is the topic of the latest podcast by CIBSE Journal. The authors of CIBSE's Covid-19 Ventilation Guidance discuss the physics of virus transmission and how the infection risk can be minimised in buildings. Appearing on the podcast are Dr Shaun Fitzgerald, director at the Centre for Climate Repair, University of Cambridge; Eimear Moloney FCIBSE, director at Hoare Lea; Dr Chris Iddon, chair of the CIBSE Natural Ventilation Group; and Abigail Hathway, lecturer at the University of Sheffield.