The advice for decontamination of vacated rooms following an AGP has been updated with regard to number of air changes per hour. It now reads:

'Vacated rooms should also be decontaminated following an AGP. Clearance of infectious particles after an AGP is dependent on the ventilation and air change within the room. In an isolation room with 10-12 air changes per hour (ACH) a minimum of 20 minutes is considered pragmatic; in a side room with 6 ACH this would be approximately one hour. Advice should be sought from IPCT.'

This is accessed at http://www.nipcm.hps.scot.nhs.uk/chapter-2-transmission-based-precautions-tbps/#a1090