Nullifire FV025 Small Ventilated Cavity Barrier is a fire rated product designed to act as an external wall cavity barrier at the required locations such as compartment floors, around windows, doors, etc. and within uninsulated cavities requiring permanent (open-state) ventilation.

In the event of a fire FV025 will expand to close the external wall cavity, providing effective fire resistance, for integrity and insulation for up to 60 minutes depending upon the construction of the external walls.

FV025 is designed for use within a 25mm cavity, and once installed will close the remaining free air gap (in front of the 4mm thick cavity barrier) of 21mm.

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• Features & Benefits
• Necessary Tools & Preparation
• Fixings & Application Instructions
• Important Information
• Considerations for the Principal Designer
• Technical Information
• Maintenance
• Typical Details

Features & Benefits

   
• Up to 60 minutes fire resistance tested in accordance with ASFP TGD19 guidance
• Nullifire FV025 is designed for use within a 25mm cavity, and once installed will close the remaining free air gap (in front of the 4 mm thick cavity barrier) of 21mm
• Allows maximum ventilation of cavities reducing the need for cavity trays or weepholes
• Suitable only for “open-state” ventilated cavities up to 25mm wide
• Lightweight - easy & quick to install
• Low smoke zero halogen high expansion intumescent material
• Water repellent resistant
• No maintenance required after installation

Necessary Tools & Preparation

Necessary Tools

• Masonry drill
• Screwdriver
• Saw/knife for cutting product
• Measuring tape
• Stainless steel fixings suited to the substrate

Preparation

• Ensure the installation area is free from dust, oil and any corrosive material
• Check the mounting substrate is solid and free from damage and degradation before beginning
• Double check for any obstructions, ensure that if there are any that could allow fire to pass vertically, they are fire stopped separately using an approved and applicable Fire Stopping product

Fixings & Application Instructions

• Affix the product using 5mm stainless steel screws or nails at a maximum spacing of 250mm using a maximum countersunk head size of 11.5mm
• Tighten any fastenings until the head is just touching the product, it should not be overtightened as this may damage the strip
• When attaching to a solid substrate ensure that the fixings are along the centre line of the fire barrier and the labelled side is facing out into the cavity (so that you can read the label once the fire barrier is installed)
• If adding additional lengths, ensure they are tightly butted up against each other

Important Information

• Before placing an order, please complete the Nullifire Project Questionnaire for suitable product recommendation and presentation to the principal designer for acceptance
• Intumescent cavity barriers are tested and designed to expand outwards, from the face of the intumescent material only, additional design details will be required to account for external corners
• The cavity barrier should not be penetrated by anything other than the mechanical fixings which are used to fix the cavity barrier to the building
• The cavity barrier should be installed onto a flat surface, with no gaps behind the cavity barrier, the maximum space in front of the cavity barrier should not be greater than 21mm
• Technical Support should be consulted in any instance where the principal designer is uncertain as to any issues which may impede the ability of the cavity barrier to perform as expected – please contact our Technical Department on 0113 2455450 (option 2) or send a message to [email protected] for details

Considerations For The Principal Designer

• The principal designer must approve the use of any cavity barrier, whether open state or full fill, in conjunction with the products fire classification reports, taking full account of the whole construction of the external wall systems and components, including any requirements of Building Regulations and or NHBC Standards
• The principal designer must sanction any interruptions, which may include items such as brackets, rails or battens, that may affect the continuous line of the cavity barrier. The principal designer must consider the combustibility, melting points and the shape of any interruptions, that are likely to prevent the cavity barrier performing as tested or as expected in the projects design
• If there are interruptions/obstructions that prevent the cavity barrier being fitted in a continuous line, and with sanction from the principal designer, the product may be cut with a sharp knife and tightly butted up against any obstructions and then restarted on the opposite side of the obstruction, the obstruction must not create a void

Technical Information

Maintenance

• No active maintenance required
• Where alterations are made around the product it should be checked visually to ensure that the product is still installed as per the approved original design and fitting instructions at the time of original installation

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 and should be applied only by an individual with the necessary expertise and experience. 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.