TL8FIRE – Rytons 9×3 Intumescent RytBlock

General Details

TL8FIRE – Rytons 9×3 Intumescent RytBlock

  • Heavy-duty intumescent air transfer grille for walls, ducts and doors.
  • In the event of a fire, the slats fuse together and give a complete seal in 2 minutes.
  • Gives up to 3 hours resistance to fire, hot smoke and gases.
  • EI rating of 2 hours when used with a cover grille.
  • Tested in accordance with BS 476 Parts 20 and 22: 1987, BS EN 1634-1: 2014 and BS EN 1364-5: 2017.
  • Temperature increase insulated for 22 minutes.
  • Galvanised steel framework protects intumescent materials by preventing inward deformation.
  • Suitable for use in high humidity.
  • May be used horizontally or vertically.
  • Compatible with Rytons 9×3 AirLiner cavity liner.

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.


  • Z275 galvanised steel framework.
  • Metal slats with intumescent core.


  • Insert into Rytons 9×3 AirLiner cavity liner and bed into position with an intumescent sealant.
  • Due to the majority of house fires starting inside the home, we recommend positioning the block at the internal end of the adjustable cavity liner sleeve.
  • Alternatively/additionally, if there is an identified risk of a fire starting externally, position the intumescent block behind the air brick.
  • The upper edge of the intumescent grille should be no higher than 3m from floor level.
  • The lower edge of the intumescent grille should be no closer than 200mm to floor level.
  • The intumescent block must be surrounded by brickwork or blockwork for it to operate successfully.

Handling Information:

  • Weight: 0.373kg.

Reference Material:

  • BS 476-20:1987 – Fire tests on building materials and structures.  Method for determination of the fire resistance of elements of construction (general principles).
  • BS 476-22:1987 – Fire tests on building materials and structures.  Method for determination of the fire resistance of non-loadbearing elements of construction.
  • BS EN 1634-1:2014 – Fire resistance and smoke control tests for door and shutter assemblies, openable windows and elements of building hardware.  Fire resistance test for door and shutter assemblies and openable windows.
  • BS EN 1364-5:2017 – Fire resistance tests for non-loadbearing elements.  Air transfer grilles.
  • European fire protection classification EI (Insulation).  The ability of a specimen of a separating element to restrict the temperature rise of the unexposed face to below specified levels.

NBS Specification:


Rytons is proud to be a family run business and British manufacturer since 1972.


Instructions for Stud Walls

Quote Request


Please note: As a manufacturer, we deal exclusively with trade professionals and are unable to take price enquiries from members of the public.
We aim to respond to quote requests within the next working day.
In case of query please call 01536 511874, thank you.

Product required (product name and code):

Quantity required (box quantities may apply):

Colour required (RAL colour matching is available on some lines subject to an additional charge):

Notes or Additional Information:

Contact Name:

Company Name:

Email Address:

Contact Number (in case of query):