What is the temperature rise of a furnace with a supply air temperature of 130°F and a return air temperature of 75°F, operating in an ambient temperature of 50°F?
A) 75°F - 50°F = 25°F temperature rise B) 130°F - 50°F = 80°F temperature rise
C) 50°F + 75°F = 125°F temperature rise D) 130°F - 75°F = 55°F temperature rise
D
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