Hydraulic closers concealed in the door leaf are increasingly
popular – but they must not be fitted to fire resistant doors without
appropriate protective measures being taken. This is because:
they require a large portion of the door to be cut away which
immediately reduces fire resistance; Frame head
many models contain flammable hydraulic oil;
the aluminium housings are likely to melt in intense heat intumescent
leading to a breach;
they are made from materials which are very good heat
conductors and take up much of the available door leaf thickness.
Our intumescent protection kits overcome these problems. head rail
They consist of a thin, high performance intumescent sheet,
pre-cut and scored so that they can be easily fitted around door
closers. The kits are self-adhesive for straightforward installation.
When tested in accordance with BS 476: Pt. 20/22: 1987 it was
shown that our closer protection kits can provide up to 60 minutes
protection, even on 44mm thickness door leaves.
The low pressure intumescent action ensures the door leaf is not
split. Insulation against heat transfer is provided as soon as the intumescent
intumescent material is activated.
1 mm thick : can be used on 30 to 60 min FR doors
2 mm thick : can be used on 90 to 120 min FR doors