How do you check a pressure regulator on a gas furnace?

How do you check a pressure regulator on a gas furnace?
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Fuel efficiency in a gas furnace is measured in AFUE (Annual Fuel Utilization Efficiency). Furnaces primarily run on natural gas or electricity. Furnaces that are used to boil water are called boilers. The term furnace also refers to the various types of metallurgical furnaces, used for smelting and other metalworks, as well as industrial furnaces, which are used in various industrial applications such as chemical plants and providing heat to chemical reactions.    Furnaces can be classified into four general categories, based on efficiency and design, natural draft, forced-air, forced draft, and condensing.    The first category of furnaces are natural draft, atmospheric burner furnaces.  These furnaces consisted of cast-iron or riveted-steel heat exchangers built within an outer shell of
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