In many parts of Europe and some states in America DPs are used as standard and no one even considers a combination of C02/and a class A extinguisher. I'm told that in the states it’s a lot to do with the fear of potential liability that may arise if someone were hurt using the incorrect type of extinguisher on a specific type of fire. ASBC DPs having a wider range of applications. In Europe, so far as I can ascertain, it seems to be more that they consider it easier for untrained/poorly trained people to achieve a rapid knock down with DP, and that cleaning up DP is a lot less hassle than cleaning up after a fire. Interestingly, I recently came across a factory which has 6 and 9KG DPs in a manufacturing area that is full of very expensive robotic production machinery. Extinguishers supplied and serviced by Chubb, so maybe they are thinking along the European / US lines?