What advantage is there to maintaining a negative pressure on the heat exchanger?

A) Combustion air can only be drawn into the oil burner if a negative pressure is maintained
B) Safety, to insure combustion products do not leak out into the air stream
C) The vent will not work unless the heat exchanger is at a negative pressure
D) The negative pressure helps draw in return air from the house, increasing efficiency


B

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Measuring intake manifold ____________________ is a way of determining the condition of an engine.

Fill in the blank(s) with the appropriate word(s).

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A) aeration B) compaction C) drainage D) an infestation

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A) Rosin core B) 60/40 with no flux C) 50/50 with acid paste flux D) Acid core

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The best way to overcome language, culture, and literacy barriers is to provide safety training programs offering: