• Envirograf Soffit Board Intumescent Ventilator

Envirograf Soffit Board Intumescent Ventilator

Product 89

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.



Fit new or replace old plastic ventilation grilles. Metal Envirograf Soffit Board Intumescent Ventilators are designed for fire protection, allowing ventilation through soffit boards, with intumescent material expanding when exposed to heat and fire, closing up ventilation holes to prevent flames from external fires entering roof and loft spaces.

Examples of use:

Fires in roofs can easily spread fast to neighbouring buildings, especially those that are terraces or semi-detached. When a fire starts in a room below, the windows can blow out, leaving the soffit board exposed to hot flames and gases. This makes soffit ventilation grilles essential over kitchen windows and in loft conversions.

Order References & Sizes

Other sizes can be made to order - please contact our sales team on 0113 245 5450, or send us a message here.

Circular grille

Ref External Diameter Opening Diameter
ES/SV/CIRC 82mm 68mm

Rectangular grilles

Ref External Dimensions Opening Dimensions
ES/SV/RECT 72mm x 215mm 47mm x 215mm
ES/SV/RECL 70mm x 590mm 50mm x 540mm


  • Rectangular grille – push recess into opening in soffit board and secure in place. 
  • Circular grille – push recess into opening in soffit board.

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 89

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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