Source: Carrier
A direct-fired heater is similar to a gas stove or gas grill. It directly transfers the heat from the internal burner to the airflow. Air is forced directly through a flame that heats the air and the unit converts 100% of its fuel into heat. This design and technology performs well against most measures of efficiency, cost, and convenience. Proper ventilation is a necessity for a direct-fired heater, so tight spaces are not ideal. Consider this unit, however, if you’re working in outdoor spaces, construction sites, or warehouses.
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