http://www.authorstream.com/Presentation/ActionDuct-3048075-kitchen-exhaust-cleaning-expertise-california/ ..... kitchen exhaust cleaning is required for virtually every commercial cooking establishment in the United States. Restaurants, hospitals, hotels, employee cafeterias and other food-service locations have a “hood” and ductwork over the stove to exhaust smoke, steam, and fumes out of the building. These exhaust gases leave a residue on the inside of the ductwork.
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