The convection plume from the cooking operation contains grease that has to be extracted as efficiently as possible. The amount of grease produced by cooking is a function of many variables, among them the type of appliance used, the temperature at which food is being cooked, and the type of food product being cooked. The more grease the filter system can extract, the longer the exhaust duct and fan stay clean, resulting in better fire safety.
Halton KSA high-efficiency filter and the cyclonic action
> Ashrae Journal, June 2003: The Facts Mechanical Grease Extraction> A la Carte
> KSA filter efficiency