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The most common burner used in induced draft furnaces is:

  1. inshot

  2. ribbon

  3. split-flame

  4. venturi

The correct answer is: inshot

Induced draft furnaces commonly use inshot burners due to their ability to provide stable and efficient combustion. Option B, ribbon burners, are typically used for applications that require low emissions and precise temperature control. Option C, split-flame burners, are generally used in larger industrial furnaces. Option D, venturi burners, are typically used in boilers and process heaters. Therefore, while these options may also be used in certain types of furnaces, they are not the most common choice for induced draft furnaces.