The NAF INDOOR mixture has the following composition on a weight percentage basis:65% fluorotrichloromethane15% difluorodichloromethane15% 1,2-dichlorotetrafluoroethane5% dipenteneThis indoor fire extinguishant NAF INDOOR mixture has been proven effective using handheld portable extinguishers on fires fueled with wood and hydrocarbons including n-heptane.