All doors must be fire rated regardless of type though Perko self closers of the double chain variety can be used (see excert from guidance notes below)
FIRE PRECAUTIONS - SUPPLEMENTARY GUIDANCE NOTES
Door closers should be of the positive self closing type and any which necessitate removal of large portions of the door or frame are to be avoided. 'Self-closing' means that the self-closure of the door should be effected by an automatic self-closing device which cannot easily be removed from the door or tampered with; this term does not include rising butt hinges.
Closers of the spiral spring pattern or any which can be easily disconnected or locked in the 90° position are also not acceptable.
Concealed PERKO door closers are acceptable providing that they are the Double chain PERKOMATIC variety. The method adopted must, in every case, be maintained to secure the effective closure of the door and overcome resistance of any latch.
