Bomb Blast Net Curtains (BBNC)- An Overview
We offer an Anti-Blast Net System in line with the current standards and advice from MI5 & other British Government Agencies.
How it works
The Bomb Blast Net Curtain (BBNC) is designed to billow and contain the splinters of shattered glass, the fabric ‘spinnakers' out and catches the flying glass, depositing them safely to the trough and preventing them from flying lethally around the room.
Bomb Blast Net Curtains (BBNC) are normally of 90 or 100 denier warp knitted polyester terylene curtain material with a bursting strength of 500kN/m. The curtain are made twice the width and one and a half times the length of the window.
Curtains should cover the width of the window without a break and where possible, the curtain should hang freely below the sill. Where this is not possible, the excess length should be folded concertina fashion and placed in shallow (6 inches) troughs at sill level. The bottom hem/tube incorporates weights at a rate of 400 grammes per metre.
BBNC should be installed 50 to 100mm from the glass. This closeness is preferred, if the curtains are further away, detached shards of glass may have the opportunity to twist and cut through the net and blast waves passing round the glass may cause the curtains to billow away ahead of the glass resulting in it not being effectively caught.
However, since filmed glass loses velocity quite rapidly after the first few hundred millimetres, it is acceptable for the curtains to be positioned further back if necessary.
BBNC is essential when windows are fitted into wooden frames to prevent large ‘splinters’ detaching.
It is recomended that Bomb Blast Nets or Bomb Blast Curtainsare cleaned every 6 months. As the dirty BBNC sets are removed the clean sets are installed in their place, subsequently washed and returned to storage in their specificaly produced packing boxes the initial set will be rotated again in due course.