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- Proceeding to development
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Details test and examination criteria for automatically operating gas-fired central furnaces for use for installation in residential, commercial, and industrial structures including furnaces for direct vent, recreational vehicle, outdoor, and manufactured (mobile) homes. This Standard applies to Category I, Category II, Category III, and Category IV central furnaces. In Canada, this Standard applies to gas-fired central furnaces having inputs up to and including 400,000 Btu/hr (117 228 W
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