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New Style Intumescent Block Grille

Product 36


All-in-one intumescent block grille with faceplates

£0.00 ex. Vat


New Style All-in-One Block Grille

New style block grille, fitted with intumescent into the plate, giving a much larger airflow, providing over 40% free ventilation area. The intumescent plate is fitted on the risk side, however, the grille provides protection on either side.

In the event that a fire occurs, the intumescent will expand to seal the grille, preventing fire and smoke from spreading.

  • Our new style Intumescent block grilles are suitable for use in ducting pipes.
  • Installed into doors and walls, as well as ventilation ducting to provide fire protection.
  • Complete with two face plates.

See the order references tab for available sizes as standard. Furthermore, other sizes are available to order.

Tested to EN1363-1 (2012), achieving integrity of 60 minutes. Also tested to EN1364-5 (2017).

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.

Envirograf ® passive fire products carry the hallmark of excellence, reflecting the high standards that prevail in its laboratory, test rig, and manufacturing plant. Envirograf® passive fire products are subject to rigorous quality control which, at all stages, ensures products remain at the leading edge of fire containment technology. This quality has earned the company and its passive fire products a high reputation. With its operating system accredited to ISO9001.


– Provides over 40% free ventilation area

– Tested to EN1363-1 (2012), achieving integrity of 60 minutes

Also tested to EN1364-5 (2017)


Case Studies

  • Priceless protection at Thornham Parva Church

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

Order References / Sizes

NEW-STYLE BLOCK GRILLE – SIZES FROM 100mm TO 300mm. Complete with faceplate.


Reference              To Suit Hole Size                  External Grille Size

NBG100                100mm x 100mm                  160mm x 160mm

NBG200                200mm x 200mm                260mm x 260mm

NBG300                300mm x 300mm                360mm x 360mm


Other sizes made to order.