Why do direct spark ignition systems use flame rectification for flame safety?
A) flame rectification is much faster than anything that relies on heat
B) the flame rod can double as a thermocouple for older furnaces
C) flame rectification is less complicated than using a thermocouple
D) flame rectification is the oldest flame producing technology
A
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a. 24 c. 48 b. 30 d. 78
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