Is CFM used in Canada?

CFM is still common on HVAC equipment and documentation. The calculator also reports the temperature rise in Celsius.

Does this select a duct heater?

No. It estimates temperature rise only. Equipment selection, airflow proving, controls, and safety limits need project-specific review.

For the same heater kW, less air carries the heat, so the calculated air temperature rise increases.

kW is heater output used for the estimate.
CFM is airflow through the heater section.
1.08 is the common imperial air heat factor used for preliminary HVAC arithmetic.
The Celsius result converts the Fahrenheit rise for Canadian metric review.

Temperature rise is estimated from heater output and airflow using common HVAC arithmetic.
Airflow should be measured or taken from a reliable design value; low airflow increases temperature rise quickly.
Actual equipment limits, staged heaters, controls, high-limit devices, and duct conditions can override the estimate.
This calculator does not select duct heater equipment, airflow settings, controls, safety devices, or HVAC/electrical installation requirements.

10 kW at 1000 cfm. A 10 kW duct heater at 1000 cfm estimates about 31.6 F, or 17.6 C, temperature rise.

Low-airflow check. A 20 kW heater at 500 cfm estimates a high temperature rise and should trigger equipment and airflow review.