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When is the AMPCO® sizing program used, and when are the GAMA or National Fuel Gas Code sizing tables used?

April 26, 2017code FUEL gama Gas National program sizing tables Used

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When is the AMPCO® sizing program used, and when are the GAMA or National Fuel Gas Code sizing tables used?

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The AMPCO® computerized sizing program is used to calculate the chimney size for a positive pressure system. The sizing tables are used to calculate chimney size for gas fired Category I appliances only.