Smoke emitter cartridges provide effective, low cost leak testing of heat exchangers, air ducts, tanks and boilers. Visual air balancing of HVAC systems. Cartridges produce clean, non-toxic, oil-free smoke through chemical reaction. Use also for fire drills as well as the placement and testing of smoke alarms/ detectors. Diversitech Smoke Emitter, Cartridge Container, Composition: Potassium Chlorate, Ammonium Chloride, Solid Article Form, White