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Gas Fitting
Gasfitter Red Seal Certification
High-Efficiency Furnaces & Safety Devices
Knowledge Check
High-Efficiency Furnaces & Safety Devices
Knowledge Check
Knowledge Check
1 / 15
What must operate before the ignition sequence begins in a modern furnace?
A
The air filter fan
B
The blower motor
C
The humidifier
D
The inducer motor (draft inducer)
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