• Envirograf Intumescent Block Grilles

Envirograf Intumescent Block Grilles

Product 36

We no longer stock this product, but can recommend Norseal Intumescent Air Transfer Grilles as our nearest alternative. Please contact our Technical Team on 0113 2455450 (option 2) or send a message to [email protected] prior to purchase/use for advice on suitability.



24-hour lead time. Contact our sales team on 0113 245 5450 for more information.

Standard sizes available from 100mm x 100mm up to 500mm x 500mm, all block grilles are 38mm thick.

Envirograf Intumescent Block Grilles are ideal for allowing airflow through fire barriers in walls and ceilings, floors, and air duct openings that require a fire seal. 

Made from metal plates that are clad in intumescent material and clad in foil, with a wire mesh front, the block grille expands in a fire to seal up the gap to prevent fire and smoke from spreading through a building and stops airflow from feeding a fire. This allows extra time for evacuating from a building, slowing a fire and containing it to minimise damage to other rooms and areas.

The grilles are made to order in a large selection of standard sizes, and can be made to order in various shapes and sizes, such as circular, with other colour options and finishes. Contact our sales team on 0113 245 5450 for more information.


Order the block grille size 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 - contact our sales team for more information.

Material Specification:

Multigraf Intumescent material chemical constitution

  • Mineral Wool Fibre 20-70% by weight
  • Exfoliating Graphite 20-60% by weight
  • Organic Binder (including adhesive coating) 5.0-30% by weight

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and ConditionsWe will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.

Any Envirograf products to be used in or for Harrods department store should be authorised with our Technical Team prior to purchase.

Product Details
Product 36

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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