6 Litre foam fire extinguisher 6 litre foam fire fxtinguisher. Quality kitemark certified to BS EN3 stored pressure AFFF (foam) fire extinguisher suitable for use on class A and B fires in offices, commercial premises. 13A 183B fire rating. Capacity: 6 Litres. Fire Rating: 13A 183B. Operating Temperature: +5 to +60 degrees centigrade. Discharge Time: 48 secs. Weight: 10kg. Height: 565mm. Width: 225mm.