TL8FIRE – Rytons 9×3 Intumescent RytBlock

General Details

TL8FIRE – Rytons 9×3 Intumescent RytBlock

  • Heavy duty intumescent grille for walls and ducts.
  • In the event of a fire the slats fuse together and give a complete seal in 2 minutes.
  • Gives 3 hours protection preventing the passage of smoke and gases.
  • Tested in accordance with BS476 Parts 20 and 22.
  • Temperature increase insulated for 22 minutes.
  • Steel framework protects surrounding intumescent materials by preventing the inward deformation.
  • May be used in high humidity.
  • Compatible with Rytons 9×3 AirLiner® cavity liners.

Free Area:

  • 5,330mm² (53.3cm²) per unit.


  • 206mm L x 58mm H x 44mm D (see image gallery above).
  • CAD drawing available by email.


  • Steel grey.


  • Steel framework protecting intumescent materials.


  • Position the intumescent block inside the ‘9×3’ AirLiner sleeve behind the air brick or at the internal end of the adjustable cavity liner sleeve (whichever location has the greater fire risk).  Note: If using the intumescent block at the internal end of Rytons ‘9×3’ Acoustic AirLiner then angle the intumescent block between the foam panels.
  • Important: The intumescent block must be completely surrounded by brickwork or blockwork for successful deployment.

Handling Information:

  • Weight: 0.373kg.

NBS Plus Specification: