ASHRAE Terminology

A Comprehensive Glossary of Terms for the Built Environment
ashrae.org/ashraeterms

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fume

solid particles formed by condensation of vapors of solid materials or a discharge gas or byproduct of combustion or chemical process. Very small airborne particles, usually less than one micrometer in size, from burning or melting materials or a chemical process. Note: popularly, the term fumes refers to any kind of air contaminant, many laws and regulations add a qualification that the contaminant have some unwanted action.