Mrs

[Guest Alison Morris]

We are a dental practice with a fire door opening on to a fire escape on the 1st floor . We would like to be able to open this door in the summer when it is hot . Are we allowed to put an opening stair gate across the doorway for safety purposes ? 

[AnthonyB]

Are you taking about a storey exit onto an external escape stair or an internal fire door onto an internal protected stair?

It could be seen to narrow and obstruct the escape and depending on how it fastens that could be an issue, but it's not necessarily an outright no. Your Fire Risk Assessor, who will be familiar with your premises and layout should be able to give a definitive site specific answer.