MUA-SVX004B-EN
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Figure 4. Standard Temperature Rise Duct Furnaces — 20–60°F (11–33°C)
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Pressure drop through the heat exchanger is based on the CFM throughput. The desired data
is obtained in the following manner:
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Select heater size based on heat loss of the building to be heated.
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Select temperature rise desired.
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Based on temperature rise, the horizontal line intersects heater temperature vs. CFM
curve.
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Follow vertical line down to select CFM.
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For pressure drop selection, follow vertical CFM line until it intersects the selected heater
performance curve vs. pressure drop.
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Follow the horizontal pressure drop line to the left, and read pressure drop of the selected
heater.
