Regin smoke products provide an inexpensive method of generating swirling smoke. These smoke emitters are ideal for testing all kinds of pressure ductwork systems and air balancing. The smoke emitted does not contain any oil or zinc and will not leave any residue. The smoke is non-toxic and has the same density as air. During this period of increasing environmental and safety concerns, these practical and economical smoke emitters are finding an ever-widening range of applications.