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|
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.
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
|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 Conditions. We 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.
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