The result of thoseĬalculation using a 38,000 BTU water heater with a 3" draft hood and a 37,500īTU boiler with a 4" draft hood connected to a 20' high chimney is to use aĬommon flue with an area of 28 square inches or a 6" flue vs a 5" flue in theĭetails about factors that go into calculating the size of a chimney or flue are discussed separately at CHIMNEY SIZE FACTORS. The 1992 GAMA vent sizing tables for single-wall metal vent connectorsĪttached to a tile lined masonry chimney uses Table 8. NFPA 1992 (7.5.3) states that draft hood appliances, Category IĪppliances and other appliances that use Type B vents must have aįlue area not less than the area of the largest vent outlet plus 50% of the area of #Chimney flume code#Watch out: Check with your local building code officials for local building code requirements when designing, building, or installing chimneys and vents. Sizing of Metal & Masonry Chimney Flues, Flues, Vents - Category I Draft Hood and Fan Assisted Appliances We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. We include excerpts from UMC tables along with additional commentary to assist in sizing metal or masonry chimneys according to chimney diameter, height, materials, and the input BTUH of the appliance(s) to be vented. This article series describes the size requirements for chimney flues for different categories of heating appliances. We have no relationship with advertisers, products, or services discussed at this website.Ĭhimney & flue sizing tables by type, BTUH, building codes, and other factor: InspectAPedia tolerates no conflicts of interest.
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