SCHEDULECONDITIONS WHICH A GAS FIRE INSTALLED IN A FIREPLACE RECESS OR FLUE BOX MUST MEET WHEN INSTALLED IN ACCORDANCE WITH INSTRUCTIONS SUPPLIED WITH THE FIRE IN ORDER THAT THE FIRE MAY BE EXEMPT FROM THE REQUIREMENT OF THE REGULATIONS FOR A FITTED GUARD
1. No naked flame or incandescent part of the firebed projects more than 50 millimetres from the vertical plane of the fireplace opening.