• Envirograf Fire & Smoke Grille
  • Envirograf Fire & Smoke Grille
  • Envirograf Fire & Smoke Grille
  • Envirograf Fire & Smoke Grille

Envirograf Fire & Smoke Grilles

Product 34

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.



Sizes (Height x Width):

Ref Internal Hole Size External Size Slots Slot Size Vent Area
NTJ1 140 x 280mm 200 x 340mm 9 100 x 10mm 90cm²
NTJ2 240 x 280mm 300 x 340mm 27 60 x 10mm 111cm²
NTJ3 190 x 305mm 250 x 365mm 20 60 x 10mm 124cm²
NTJ4 270 x 305mm 325 x 365mm 30 60 x 10mm 186cm²
NTJ5 340 x 380mm 400 x 440mm 52 60 x 10mm 347cm²

Types available:

Manual Reset

Reset by hand, usually through use of a pen or screwdriver with a permanent loading of 125mA 24V.

Automatic Reset (A)

Resets itself, with a permanent loading of 125mA, with a re-set loading of 6A 24V for a period of 1 second

Thermal Break (TL)

Non-electrical. Contains a thermal breaker that activates at 70ºC, automatically closing the shutter.

Memory Spring (MS)

Non-electrical. Contains a memory spring device, closing the shutter automatically in a temperature range of 50ºC to 65ºC in about 47 seconds.

Both Thermal and Memory options are ideal for when wiring isn't appropriate.


N/O - Normally open, closing during fire.

N/C - Normally closed, opening during fire.

Available in white or brown finishes, more colours and sizes can be ordered specially - contact our sales team on 0113 245 5450 for more information.

Envirograf Fire & Smoke Grilles fulfill a regulation requirement for fire and smoke protection grilles over openings in walls and ceilings, fire doors and entry points for ventilation ducts, these grilles automatically close when activated and are available in 4 reset options.

Both manual and automatic options can be wired into an existing 24V fire alarm system, or used with the Envirograf SG/S Smoke Detector and Base with Terminals, and Envirograf 240V to 24V Envirograf Control Unit For Smoke & Vent Grilles.


More and further information can be found in the Application Guide in our download section below.

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
BTC 11111F 66 Minutes 26 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 34

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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