Question: Natural draft furnaces are typically ___________________ AFUE efficiency level. Question 4 options: over 90 % under 78 % Over 78 % 75 %
Natural draft furnaces are typically ___________________ AFUE efficiency level.
Question 4 options:
|
| over 90 % |
|
| under 78 % |
|
| Over 78 % |
|
| 75 % |
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