Selecting an Air Heater

The energy (kW) requirement is calculated from the following formula:

This formula estimates the heater size needed to raise air temperature from Tinlet to Texit at a given SCFM.

SCFM = Air flow in Standard* Cubic Feet per Minute
Tinlet = Inlet Air Temperature (°F) (typically 70°F)
Texit = Desired Exit Air Temperature (°F)

Example: Heating 10 SCFM from ambient temperature (70°F) to 800°F:

Conversion Formulas:
(Liters per Minute) / 28.3 = Cubic Feet per Minute
°C = 5/9 (°F − 32)
°F = 9/5 °C + 32

*Please refer to "Using an Air Heater" for an explanation of Standard flowrate.