The law requires employers to ensure an adequate supply of fresh air in the workplace and this has not changed during the pandemic.
Good ventilation reduces the concentration of the virus in the air and therefore reduces the risks from airborne transmission. This happens when people breathe in small particles (aerosols) in the air after someone with the virus has occupied an enclosed area.
However, ventilation will have little or no impact on droplet or contact transmission routes.
You should consider ventilation alongside the relevant control measures required to reduce the risk of transmission as part of making your workplace COVID-secure.
Providing adequate ventilation does not mean that workplaces have to be cold.
Good ventilation is a balance between making sure workplaces are warm but keeping a flow of air going through an area.
Simple steps, such as partially opening windows, can be taken to ensure ventilation is maintained. Natural ventilation can be used with heating systems to maintain a reasonable temperature in the workplace.
Airing rooms as frequently as you can will help improve ventilation. This involves opening all doors and windows wide to maximise the ventilation in the room. It may be easier to do this when the room is unoccupied or between uses.
See more on the HSE website