Following a fire risk assessment, doors are sometime re-designated as fire doors if the door and frame are substantial enough for a door to be justifiably counted as a nominal fire door. The same applies to older fire doors which do not follow the latest specifications. In these cases fire door seals are retrofitted. To avoid having to cut a rebate in either the door or the frame, surface mounted fire door seals can be fitted. These are stuck to the frame or door with their self-adhesive backing and sometimes nailed as well to give them increased longevity.
Where a fire door rebate already exists or the existing rebated fire door seal has been damage, rebated intumescent fire door seals can be fitted.
All our fire door seals are fire and smoke seals. This means that they contain intumescent that swells if a fire breaks out and seals the gap around the fire door. They also contain a brush-type smoke seal to stop smoke travelling through the gap. There are some applications where a gap should not be smoke proved: eg if the fire door has been installed on the exit of a room which has no smoke detectors on its own. In this case the fire alarm system can only be triggered if smoke can leak out around the fire door and set off the fire alarm system in the circulation spaces. But these cases are quite rare.
Fire door seals are fitted on three sides of a fire door with the gap underneath the door not being covered.