• Envirograf Intumescent MG & MGL Grilles
  • Envirograf Intumescent MG & MGL Grilles

Envirograf Intumescent MG & MGL Grilles

Product 35

Unfortunately, we no longer stock this product; please contact our technical team on 0113 2455450 (option 2) or send a message to [email protected] where we will be happy to offer you up to 10% off a suitable alternative product for your project.




Select Single-sided for risk of fire from one side, Double-sided for risk of fire from both sides

Ref External size (H x W) Hole Size (H x W) Openings
MG1 150mm x 200mm 100mm x 150mm 10
MG2 200mm x 200mm 150mm x 150mm 14
MG3 275mm x 200mm 225mm x 150mm 22
MG3A 200mm x 275mm 150mm x 225 24
MG4 275mm x 275mm 225mm x 225 30
MG4A 300mm x 300mm 250mm x 250 33
MG5 350mm x 350mm 300mm x 300 52
MG6 350mm x 425mm 300 x 375 75
MG8 425mm x 425mm 375 x 375 90
MG8A 350mm x 500mm 300 x 450 84
MG9 500mm x 500mm 450 x 450 126
MG11 550mm x 550mm 500 x 500 132


  • Slotted
  • Louvre (L)


  • Brown
  • White
  • Stainless Steel

Other sizes and colours can be made to order - contact our sales team on 0113 245 5450 for more information.

Grilles must be fitted in the correct orientation, ie height = vertical and width = horizontal measurements.

Envirograf Intumescent MG & MGL Grilles allow airflow through doors and walls via a slotted design or a louvre style for privacy. Both styles have intumescent material that expands during fire, sealing up ventilation to prevent the spread of flames and smoke for up to an hour, containing a fire to help aid evacuation and prevent more damage to a building.

Supplied in sets of 2, in 2 configurations; double plates are for when fire could attack from either side of a door or wall, and single-sided is for when only one side is at risk of fire.


The sets are defined in two ways: the /D version is for use in situations in which the risk is double-sided (that is, the opening could be attacked by fire from either side); and the /S version is for use in situations in which it has been clearly identified that only a single side of the opening is at risk.

When fitting the /S version, the intumesced plate is placed on the risk side and the plain plate is placed on the opposite side of the opening.

Order the grilles to suit the opening to be protected – the external measurement of the grille needs to be at least 50mm larger than the opening to allow for fixing.

Special sizes can be produced (prices quoted on request).

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

Test Details:

Test Integrity Insulation
Fulmer Yarsley - J84201/7 73 Minutes 6 Minutes
B.T.C - 11081F (a) 64 Minutes 54 Minutes

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 35

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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