Nullifire FV025

FV025 Small Ventilated Cavity Barrier is suited to an open state cavity of up to 25 mm, manufactured from a directionally expansive intumescent material encapsulated in a foil barrier.


FV025 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, to reinstate fire resistance performance. 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 performance ability of the external walls. FV025 is designed for use within a 25 mm cavity, and once installed will close the remaining free air gap (in front of the 4 mm thick cavity barrier) of 21 mm.

Safety data sheet must be read and understood before use.


Product Benefits

  • Up to 60 minutes fire resistance tested in accordance with ASFP TGD19 guidance
  • Allows maximum ventilation of cavities reducing the need for cavity trays or weepholes
  • Suitable for “open-state” ventilated cavities up to 25 mm wide
  • Lightweight – easy & quick to install
  • Low smoke zero halogen high expansion intumescent material
  • Water repellent resistant
  • No maintenance required after installation





FV025 Data Sheet (en-GB).pdf


FV025 Safety Data Sheet (en-GB).pdf