What causes flue gas condensation?
A) operating the furnace during times of high relative humidity
B) cold air being pulled through the vent on the off cycle drops the vent temperature below the dewpoint of the surrounding air
C) the flue gas is cooled below the dewpoint of the combustion gas
D) water naturally condenses on metal surfaces
C
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This configuration is of the hydrocarbon, ____.
?
? 
A. ?methane B. ?pentane C. ?octane D. hexane
Un accesorio hermético utilizado para proporcionar una conexión de la tubería eléctrica sellada contra el agua se denomina:
a. casquillo. b. casquillo tipo Myers. c. conduleta. d. casquillo de uniones
Port fuel-injection systems generally use what type of injector driver?
A) Peak and hold B) Pulsed C) Pulse-width modulated D) Saturated switch
What is the minimum AFUE rating for a new furnace in the United States?
What will be an ideal response?