Mr

[Guest Damian Smith]

I don't come across this type of closer too often, but what are their pros and cons and do they pass UK certification for a FD30 door-set?

[Neil Ashdown MAFDI]

This self-closer is not suitable for a fire resistant door.  Read the section on door self-closing devices at this document for more information:  https://www.firecode.org.uk/