Efficiency of recirculation hoods

Recirculation hoods equipped with carbon and plasma filters are becoming more and more popular. The aim of this study is to determine the effectiveness of recirculation hoods with regard to PM2.5 and NOx removal in a 26 m3 lab kitchen with a gas furnace. With the carbon filter PM2.5 is reduced for about 30%. A fresh carbon filter removed about 60% of the NO2, dropping within a few weeks of cooking to 20%. With the plasma hood NO2 concentrations were above the WHO 1-hour limit and the Dutch health council 15 minutes limit.

Full Scale Test Method for Gas Contaminant Removal Device

Activated carbon filters have been used forpurification of air and water in industrialapplications. However these technologies have notbeen applied to the non-industrial builtenvironment in general and there is no standard toquantify or to classify the performance of thesesystems for in-duct mechanical systemapplication.