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| % Fuel Lost to Heat Excess & Tramp Air to Flue Temp | ||||||||||
| O2 %/vol (Dry Basis) | %Excess Air | Furnace Flue Temperature(°F) | ||||||||
| 1,400 | 1,500 | 1,600 | 1,700 | 1,800 | 1,900 | 2,000 | 2,100 | 2,200 | ||
| 2.2% | 10.0% | 2.4% | 2.6% | 2.8% | 3.0% | 3.1% | 3.3% | 3.5% | 3.7% | 3.8% |
| 3.1% | 15.0% | 3.7% | 3.9% | 4.2% | 4.4% | 4.7% | 5.0% | 5.2% | 5.5% | 5.8% |
| 4.0% | 20.0% | 4.9% | 5.2% | 5.6% | 5.9% | 6.3% | 6.6% | 7.0% | 7.3% | 7.7% |
| 4.7% | 25.0% | 6.1% | 6.5% | 7.0% | 7.4% | 7.8% | 8.3% | 8.7% | 9.2% | 9.6% |
| 5.4% | 30.0% | 7.3% | 7.8% | 8.4% | 8.9% | 9.4% | 9.9% | 10.5% | 11.0% | 11.5% |
| 6.1% | 35.0% | 8.5% | 9.2% | 9.8% | 10.4% | 11.0% | 11.6% | 12.2% | 12.8% | 13.4% |
| 6.7% | 40.0% | 9.8% | 10.5% | 11.2% | 11.9% | 12.6% | 13.3% | 14.0% | 14.7% | 15.3% |
| 7.2% | 45.0% | 11.0% | 11.8% | 12.6% | 13.3% | 14.1% | 14.9% | 15.7% | 16.5% | 17.3% |
| 7.7% | 50.0% | 12.2% | 13.1% | 14.0% | 14.8% | 15.7% | 16.6% | 17.4% | 18.3% | 19.2% |
| 8.2% | 55.0% | 13.4% | 14.4% | 15.3% | 16.3% | 17.3% | 18.2% | 19.2% | 20.1% | 21.1% |
| 8.6% | 60.0% | 14.7% | 15.7% | 16.7% | 17.8% | 18.8% | 19.9% | 20.9% | 22.0% | 23.0% |