Here is the smoke mask in its test chamber, an aquarium.  One Andersen impactor is open to the chamber; the other impactor is inside the red smoke mask.  A small fan at the center of the aquarium circulates smoke made by electrically heating paper, cloth, and plastic contained in the dish at the left. 

This photo shows plates of the Andersen impactor and substrates below the plates, after a test.  The plates and substrates that correspond to the largest particles are on the left, and progress to those for the smallest particles on the right.  The orange filter contained the most particles. 

This photo shows a close-up of the smoke source after a test.  The paper, cloth, and plastic were wrapped with nichrome wire that was heated electrically using a Variac to control voltage. 

This photo shows a closeup photo of the deposits on an impactor plate after a test.  Note the spike-like deposits, one below each hole in the impact