Regin Fumax Smoke Pellets (pack of 10) . Pack of 10 pellets BS5440 Part 1 compliant For the testing of flues, chimneys, pipework, drains and other visual air testing Approx. 30 second burn time Each pellet produces an estimated 5 cubic metres of white smoke The smoke produced has an ideal density for flue testing Encapsulated for ease of use and disposal