I have a 3 zone office building that uses gas furnaces for the main source of heat and downstream they installed tutco duct heaters in every room as supplemental heat. I keep burning up elements because the airflow is not sufficient by the time it gets to the heater. They just keep cycling on and off with the limit. The blower motor is wired to run all the time on high speed. Any suggestions?
Tutco duct heater
Festis8
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There should be a listed temperature rise. If you are above that your airflow is low. Are dampers shut anywhere? Flow proof and proper CFM are two different things. 
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