Key Features of Electric Duct Heater With Corrosion Resistant Steel Frame

• Safety - Because the heater coil is completely encased in a grounded metal sheath, shock hazard due to accidental contact are eliminated. Heaters installed close to a register, grille or access door should either use finned tubular construction or an open coil unit with a protective screen.
• Serviceability - In the unlikely event of element failure, it is easier to replace individually mounted finned tubular elements than open coil elements.
• Mechanical Stability - Finned tubular elements are more rugged than open coils. They will withstand more physical abuse.
• Airflow Uniformity - Finned tubular duct heaters tend to be more tolerant of non uniform airflow conditions. Heat conducted along the element length reduces or eliminates hot spots resulting from non uniform airflow. With open coil heaters, it may be necessary to use a pressure plate to compensate for bad airflow conditions.
• Controllability - Because of their relatively high thermal inertia, finned tubular elements controlled with on/off thermostat systems provide more precise control. Furthermore, finned tubular elements cycle at a reduced rate, thus increasing the life of the power components such as contactors. Nevertheless, when SCR controllers are used, equally precise control can be obtained with either construction.