National Fuel Gas Code does not include alternate sizing methods for fan-assisted combustion systems. There-fore, until engineering data is developed to allow alternate sizing methods for Category I fan-assisted central fur- Furnace Vent Connector Diameter.
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Gas Furnace FIGURE 8: Combustible Floor Base Accessory FIGURE 9: Ventilation of the National Fuel Gas Code, ANSI Z223.1 or Sections AIR/VENT PIPE SIZING" section in these instructions when installing
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