Abstract
A simple portable smoke generator to produce ammonium chloride smoke has been designed. Unit has been found to produce smoke of about 0.7 micron mass mean diameter with 1.12 geometric standard deviation. Further it has high obscuring power and long settling time suitable for studying room ventilations. Unit can be operated continuously over a period of three hours at 4.5 liters per minute before recharging. Generator is inexpensive, uses common chemicals and weighs only about 350 gm, when freshly charged.