6
Table 1. Furnace Airflow Data
| Heating |
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| External Static Pressure (Inches Water Column) |
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Model | Input | Motor | Motor | 0.1 |
| 0.2 |
| 0.3 | 0.4 |
| 0.5 |
| 0.6 |
| 0.7 |
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| 0.8 |
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Number | (Btuh) | High* | HP | 1310 |
| - | 1260 |
| - | 1210 |
| - | 1160 |
| 45 | 1100 |
| 47 | 1040 |
| 50 | 980 |
| 53 | 920 |
| 56 | CAPACITIES |
Speed | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise | CFM |
| Rise |
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| High* |
| 950 |
| 36 | 920 |
| 38 | 890 |
| 39 | 850 |
| 41 | 800 |
| 43 | 750 |
| 46 | 690 |
| 50 | 630 |
| 55 |
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40,000 | Medium | 1/5 | 740 |
| 47 | 710 |
| 49 | 680 |
| 51 | 650 |
| 53 | 600 |
| 58 | 550 |
| 63 | 490 |
| - | 430 |
| - |
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| Low** |
| 620 |
| 56 | 590 |
| 59 | 560 |
| 62 | 520 |
| - | 470 |
| - | 410 |
| - | 350 |
| - | 290 |
| - |
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| High* |
| 1330 |
| - | 1280 |
| - | 1230 |
| - | 1170 |
| - | 1120 |
| - | 1030 |
| - | 940 |
| 37 | 850 |
| 41 |
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40,000 | Medium | 1/3 | 1190 |
| - | 1160 |
| - | 1110 |
| - | 1060 |
| - | 1010 |
| - | 910 |
| 38 | 820 |
| 42 | 720 |
| 48 |
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| Low** |
| 830 |
| 42 | 810 |
| 43 | 780 |
| 44 | 760 |
| 46 | 720 |
| 48 | 670 |
| 52 | 610 |
| 57 | 550 |
| 63 |
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60,000 | Medium | 1/3 | 1160 |
| 45 | 1120 |
| 46 | 1080 |
| 48 | 1050 |
| 49 | 990 |
| 52 | 940 |
| 55 | 890 |
| 58 | 830 |
| 63 | — | |
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| Furnace | ||||||||||||||||||||
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| Low** |
| 800 |
| 65 | 780 |
| 67 | 760 |
| 68 | 740 |
| 70 | 710 |
| 73 | 680 |
| - | 650 |
| - | 620 |
| - | |
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| High* |
| 1490 |
| 46 | 1450 |
| 48 | 1390 |
| 50 | 1310 |
| 53 | 1210 |
| 57 | 1100 |
| 63 | 980 |
| - | 830 |
| - |
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80,000 | Medium | 1/3 | 1230 |
| 56 | 1200 |
| 58 | 1150 |
| 60 | 1080 |
| 64 | 1010 |
| 69 | 910 |
| - | 810 |
| - | 680 |
| - |
| |
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| Low** |
| 780 |
| - | 750 |
| - | 720 |
| - | 680 |
| - | 630 |
| - | 570 |
| - | 510 |
| - | 440 |
| - |
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| High* |
| 1840 |
| - | 1780 |
| - | 1700 |
| 41 | 1630 |
| 42 | 1550 |
| 45 | 1470 |
| 47 | 1380 |
| 50 | 1290 |
| 54 | Airflow |
80,000 | High* | 1/2 | 1910 |
| 45 | 1860 |
| 47 | 1780 |
| 49 | 1700 |
| 51 | 1620 |
| 53 | 1520 |
| 57 | 1420 |
| 61 | 1310 |
| 66 | ||
1600 |
| 43 | 1560 |
| 44 | 1470 |
| 47 | 1400 |
| 49 | 1350 |
| 51 | 1280 |
| 54 | 1210 |
| 57 | 1150 |
| 60 |
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| 1380 |
| 50 | 1350 |
| 51 | 1300 |
| 53 | 1250 |
| 55 | 1190 |
| 58 | 1120 |
| 62 | 1040 |
| 67 | 960 |
| - |
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| Low |
| 1100 |
| - | 1050 |
| - | 1000 |
| - | 950 |
| - | 900 |
| - | 850 |
| - | 800 |
| - | 750 |
| - |
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100,000 | 1/2 | 1640 |
| 53 | 1620 |
| 53 | 1540 |
| 56 | 1480 |
| 58 | 1420 |
| 61 | 1340 |
| 65 | 1250 |
| 69 | 1150 |
| 75 | Data | ||
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| Low |
| 1230 |
| - | 1210 |
| - | 1180 |
| - | 1140 |
| - | 1090 |
| - | 1030 |
| - | 960 |
| - | 880 |
| - | |
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| 1440 |
| 60 | 1410 |
| 61 | 1370 |
| 63 | 1320 |
| 66 | 1270 |
| 68 | 1210 |
| 72 | 1140 |
| - | 1060 |
| - |
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| High* |
| 1860 |
| 56 | 1800 |
| 58 | 1730 |
| 60 | 1650 |
| 63 | 1570 |
| 66 | 1480 |
| 70 | 1380 |
| 75 | 1270 |
| 82 |
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120,000 | 1/2 | 1650 |
| 63 | 1610 |
| 65 | 1550 |
| 67 | 1480 |
| 70 | 1410 |
| 74 | 1320 |
| 79 | 1230 |
| 84 | 1120 |
| - |
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| 1440 |
| 72 | 1410 |
| 74 | 1380 |
| 75 | 1320 |
| 79 | 1280 |
| 81 | 1220 |
| 85 | 1150 |
| - | 1080 |
| - |
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| Low |
| 1230 |
| - | 1210 |
| - | 1180 |
| - | 1140 |
| - | 1090 |
| - | 1030 |
| - | 960 |
| - | 880 |
| - |
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| High* |
| 2260 |
| - | 2200 |
| - | 2140 |
| - | 2070 |
| - | 1990 |
| - | 1910 |
| - | 1810 |
| 57 | 1710 |
| 61 |
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120,000 | 3/4 | 1870 |
| 56 | 1840 |
| 56 | 1790 |
| 58 | 1760 |
| 59 | 1710 |
| 61 | 1660 |
| 63 | 1610 |
| 65 | 1560 |
| 67 |
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| 1540 |
| 67 | 1530 |
| 68 | 1510 |
| 69 | 1470 |
| 71 | 1430 |
| 73 | 1370 |
| 76 | 1300 |
| 80 | 1220 |
| 85 |
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| Low |
| 1360 |
| - | 1330 |
| - | 1310 |
| - | 1280 |
| - | 1250 |
| - | 1220 |
| - | 1190 |
| - | 1150 |
| - |
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| High* |
| 1050 |
| - | 1005 |
| - | 960 |
| - | 915 |
| - | 855 |
| - | 800 |
| - | 730 |
| 48 | 670 |
| 53 |
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40,000 | Medium | 1/3 | 990 |
| - | 950 |
| - | 905 |
| - | 860 |
| - | 810 |
| - | 760 |
| 46 | 700 |
| 50 | 650 |
| 54 |
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| Low** |
| 770 |
| 46 | 740 |
| 48 | 700 |
| 50 | 660 |
| 53 | 625 |
| 56 | 580 |
| 61 | 540 |
| 65 | 500 |
| 70 |
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| High* |
| 1175 |
| 45 | 1125 |
| 47 | 1075 |
| 49 | 1030 |
| 51 | 970 |
| 54 | 920 |
| 57 | 860 |
| 61 | 800 |
| 66 |
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60,000 | Medium** | 1/3 | 1075 |
| 49 | 1040 |
| 51 | 995 |
| 53 | 950 |
| 56 | 900 |
| 59 | 840 |
| 63 | 790 |
| 67 | 720 |
| 73 |
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| Low |
| 800 |
| 66 | 770 |
| 69 | 745 |
| 71 | 710 |
| 74 | 670 |
| - | 630 |
| - | 580 |
| - | 530 |
| - |
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