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Direct-Fired Formulas
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Heating Requirements
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| Input BTU/Hr = |
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(Blower SCFM * Temp Rise * Density Factor) / .92 |
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| Temp Rise = |
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(Input BTU/Hr * .92)
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Blower SCFM * Density Factor
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| Density Factor = |
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1.08 +
| (70-Blower Temp) * .024
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10
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Output BTU/Hr
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| Output BTU/Hr = |
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Input BTU/Hr * .92
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Profile Velocity
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| Profile Velocity = |
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945 * sqrt(Profile Pressure / 0.075)
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Burner Areas
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| 6 Inch Straight = | .32 sq ft. |
| 12 Inch Straight = | .65 sq ft. |
| T Section = | .77 sq ft. |
| Ell Section = | .65 sq ft. |
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