Field glossaryType I hoodA grease hood over cooking appliances, with listed filters, a welded grease duct, clearances, and suppressionUsed across 2 Anvilfield field guides, most in HVAC. Where this shows upHVACKitchen grease duct field guideHVACMakeup air unit field guide Related termsType II hoodAHJcfmClearance to combustiblesESPin. w.c. / in. wgUpblast fan Back to the full field glossary