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[[Image:rangesystem16.png]][[Image:hoodandfiresystem.gif]]A Kitchen Ventilation Hood is an air-intake device that is first, designed to capture vapors, fumes, smoke, steam, heat or odors from commercial food and heat-processing equipment, and second remove the captured matter by means of a mechanical exhaust system.[[Image:stainlessrangehoods256.gif]] A Kitchen Ventilation Hood is an air-intake device that is first, designed to capture vapors, fumes, smoke, steam, heat or odors from commercial food and heat-processing equipment, and second remove the captured matter by means of a mechanical exhaust system. A Kitchen Ventilation Hood is required when a Food Processing Establishment uses Heat-Processing equipment for food or utensils which produces grease, vapors, steam, fumes, smoke, or odors. A Type 1 Hood is a Hood that is designed for collecting and removing vapors, steam, fumes, odors and GREASE and SMOKE produced by Heat-Processing Equipment while a Type 2 Hood is a Hood that is designed for collecting and removing vapors, steam, fumes, and odors produced by Heat-Processing Equipment. A Type II Hood Should NOT be used over Heat-Processing Equipment that produces Grease or Smoke.Ductwork must be single-seam welded no less than 18" to combustibles. The duct must be 6" to limited combustibles. Two layers of 5/8" drywall on a wall with wooden studs is still considered a combustible. The wall must have metal studs or high-hat installed between the wood and drywall.[[Image:nameallthegreasehoodparts.gif]][[Image:exhaustfanexamples.gif]]New UL 300 compliant wet chemical fire suppression systems are now required to be installed for the protection of the hood plenum area. Most modern fire suppression systems include a mechanical gas shut-off valve (mentioned below) and an electronic micro switch is supplied with the system.[[Image:HoodFireSuppression001.gif]] New UL 300 compliant wet chemical fire suppression systems are now required to be installed for the protection of the hood plenum area. Most modern fire suppression systems include a mechanical gas shut-off valve (mentioned below) and an electronic micro switch is supplied with the system. A Plenum is an enclosure that is designed to contain Exhaust or Supply Air of different pressure levels for removal or delivery.[[Image:FireClasses.png]]