Fire extinguisher older models also achieved class B and C fire-fighting capability in the past, current models are rated A:K (Amerex, Ansul, Buckeye and Strike First) or K only (Badger/Kidde). Clean agents extinguish fire by displacing oxygen (CO or inert gases), removing heat from the combustion zone (Halotron-1, FE-36, Novec 1230) or inhibiting the chemical chain reaction (Halons). They are referred to as clean agents because they do not leave any residue after discharge which is ideal for protecting sensitive electronics, aircraft, armored vehicles and archival storage, museums, and valuable documents. Halon was completely banned in Europe and Australia except for critical
Bradford City stadium fire warmer; one of them ran to the back of the stand for a fire extinguisher but found none. A police officer shouted to a colleague for an extinguisher. However, his call was misheard and instead the fire brigade were radioed. The call was timed at 3:43 pm. However, the fire escalated rapidly and flames became visible, and so police started to evacuate the stand. The blaze began to spread; the roof and wooden stands were soon on fire. One eyewitness, Geoffrey Mitchell, told the BBC: "It spread like a flash. I've never seen anything like it. The smoke was choking.