DUSTS are airborne solid particles with variable dimensions, which are generated during crushing process of organic and inorganic solid substances.

MISTS are airborne droplets which are created when a fluid evaporates and then condenses or with a mechanical nebulization (they can have an aqueous or organic base).

FUMES are particles generated from evaporating or fused metal secondly quickly cooled, with very small dimension inferior to 0,4 μm; they generally are generated during combustion, fusion or welding processes.

Le polveri, le nebbie e i fumi sono perciò delle particelle solide sospese nell'aria che per essere rimosse necessitano di un filtro meccanico-elettrostatico.

GASES are substances that in the normal environment conditions are in aeriform phase. Typical examples are: Oxygen, Nitrogen, carbon dioxide.
Vapours are fluids, produced by transformation from a solid or liquid state to an aeriform state, through evaporation or boiling processes. Typical examples of vapours asolvents like: acetone, toluol and hexane.