On April 3, the REHVA COVID-19 guidance has been updated with the following revisions and additions:

• Latest information on the airborne transmission and implications to HVAC systems was added;
• Ventilation continuous operation guidelines were updated to be explicit;
• SARS-CoV-2 stability data at different temperatures and relative humidity was added;
• Heat recovery equipment guidance was revised including the recommendation of inspection;
• Guidance for room level circulation units was complemented;
• HVAC maintenance personnel protection recommendation was added;
• A summary of 14 points of practical measures for building services operation was added.

Visit our COVID-19 guidance webpage for more information: updated bibliography. We have also set up a FAQ Frequently Asked Questions section and translations of the first guideline in 8 languages.

Feel free to share the information in your network or contribute with updates as indicated in the document.

REHVA thanks the co-authors for their much-appreciated contribution.