The term 'Chimney Output' refers to the materials that are emitted from a chimney. This includes ASH, SMOKE, and SOOT. ASH is a fine powdery material that is created when something is burned. SMOKE is a gaseous byproduct of combustion that is made up of tiny particles. SOOT is a black or dark brown substance that is composed of carbon particles and is a result of incomplete combustion. All three of these materials are released through a chimney and are considered to be the chimney output.