Offers fire protection to standard size BESA conduit boxes in ceiling roses, expanding to 36 times its normal size in the event of a fire. Flexible and easy to install. Thin enough to not impede internal wiring, allowing cables to pass through, and can be penetrated. Tested to BS476 Part 22 with in excess of 2 hours fire protection. Specifications: W x L x H: 68 x 68 x 4mm.