The Facts about mechanical greese filters

Matti Lehtimäki, Aimo Taipale

    Research output: Contribution to journalArticleScientificpeer-review


    Many kitchen hood manufacturers claim the efficiency of their grease filters is 90% or higher, and they reference several standards1,2 to support the performance measurements. Unfortunately, none of these standards represents filter performance under cooking conditions. Grease emissions from cooking processes consist of paniculate and vapor. Mechanical grease extractors are effective only at capturing particulate and are not able to extract vapor.

    That is why, theoretically, the maximum grease extractor efficiency cannot exceed the mass fraction of particulates in the total cooking emissions. This maximum efficiency depends on cooking operations and ranges from 2% to 70% for electric ovens and gas broilers, respectively, based on the percentage of vapor in the emissions from cooking operations.
    Original languageEnglish
    Pages (from-to)14-17
    Number of pages4
    JournalASHRAE Journal
    Issue number6
    Publication statusPublished - 2003
    MoE publication typeA1 Journal article-refereed


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