Ventilated Cavity Fire Barrier VFB Plus 40 mm x 75 mm x 1000 mm sp/3311185. Tenmat’s VFB Plus Ventilated Fire Barriers are ’open state’ cavity fire barriers for ventilated cavities of up to 450mm. The VFB Plus then leaves a maximum 44mm air gap to allow for drainage and maintain ventilation in normal use.
eBay