Perimeter Seal by Norsound

  • • BS 476 part 20:22
  • • BS EN 140:3
  • • Protects against fire
  • • Protects against smoke
  • • Quick installation
  • • Sound reduction up to 55dBRw
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NORfast is a revolutionary retro-fit seal.

Using dual air pocket technology, NORfast effectively creates a seal between the door and the stop, which boosts the acoustic performance of the door by up to 48dB.

NORfast provides excellent fire and smoke sealing, tested up to 30 minutes in accordance with BS 476: Part 22: 1987: and BS 476: Part 31: 1987 (please refer to our 'downloads' to find further information).

Designed to include a PVC-housed intumescent strip, NORfast is capable of expanding or swelling (intumescing) under extreme heat, which provides a greater seal in the event of fire.

The recommended gap tolerance is 3mm - 4mm.

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Would I require a separate smoke seal if I use the NORfast?

No. Since the NORfast is a continuous acoustic seal it acts as a smoke seal, better in some ways than standard intumescent smoke seals.

What size rout does the seal fit into?

The NORfast doesn‘t need a rout as it uses self adhesive on its base to adhere straight to the frame.

Can I use the NORfast on latched doorsets?

Yes, due to the fitment position of this seal, it is unaffected by door furniture.

What's that tagged onto the side of the NORfast? It looks like there's an intumescent strip attached to a NOR710.

Absolutely correct! Not only does the NORfast have all the acoustic and smoke sealing, along with the draught excluding of a NOR710, it also carries with it a strip of our intumescent seal, adding Fire Protection to an already great product.