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Intumescent block grilles

Product 36


Slim-profile, versatile intumescent block grilles for use in doors, walls or ducting

£0.00 ex. Vat


Block Grilles

Non-clogging intumescent block grilles, giving 90% free ventilation area which seals up completely in a fire. Consists of metal plates clad in intumescent and covered in foil, with a wire mesh frontage.

In the event that a fire occurs, the intumescent will expand to seal the grille, preventing fire and smoke from spreading. Intumescent block grilles are suitable for use in ducting pipes. Installed into doors and walls, as well as ventilation ducting to provide fire protection.

  • Dependent on the shape of the ventilation gap, block grilles are tailored to fit all shapes, including round, oblong and square.
  • Where needed, the edges of grilles can be sealed with mastic and adhesives.
  • Designed in sizes between 15mm to 38mm depth, with special orders made where required.

This product underwent a fire resistance test employing general procedures and criteria of BS476 Part 22 (1987). Achieved integrity of 240 minutes. Also tested under EN1366-3:2005 – 127 minutes and EN1363-1:2000, EN13501-2:2004 – 120 minutes.

Specially designed passive fire range to meet Document B of Building Regulations, and also tested to European Standards. For more information, browse our full range of ventilation products online.


– For use in fire barrier walls, doors and duct openings

– Provides an effective fire seal for up to 4 hours, whilst offering free air movement

– Standard grille is square, but a circular version can be made to order if required

Application Instructions

Order the block grille to suit the opening to be protected. The block grille simply pushes into
place. Mastic or silicone sealant can be used around the edges if required. Grilles can be made
with lugs to screw into place for ceiling applications if required. Any type of grille front can be
used or Envirograf front plates can be supplied (available in standard sizes or can be made to
New Block Grille – this is a complete unit with front plate attached. Block grille section pushes
into the opening and the whole unit is secured in place with screws through the attached front

Case Studies

  • Priceless protection at Thornham Parva Church

    Protecting the unique oak retable at Saint Mary’s Church.

Order References / Sizes

All block grilles are 38mm thick, giving up to 4 hours of fire protection. Can be made to other sizes and shapes.

Standard Sizes available from 100mm x 100mm up to 500mm x 500mm – Please select the combination(s) of height x width you require

Please Note: These are not stock items, although they can normally be made within 24 hours


SEE ALSO: NEW-STYLE BLOCK GRILLE – SIZES FROM 100mm TO 300mm. Complete with face plate.