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[[Image:rangesystem16.png]][[Image:rangesystem16.png]][[Image:hoodandfiresystem.gif]]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]]