Duct Heaters
High efficiency, compactness and ease of installation make the utilization of a Forced-Air Duct Heater an ideal solution in applications where fan-forced heating is required. Two designs are available based on the operating temperature;
- Medium performance duct heaters, for up to 750°F outlet temperatures
- High performance duct heaters, for up to 1100°F outlet temperatures
The heat source is a set of tubular elements that are arranged in an optimum configuration to minimize the pressure drop.
| CFM | Temperature Rise (°F) | |||||||||||
| 50 | 100 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 550 | 600 | |
| Kilowatt estimation at standard conditions with 20% safety factor | ||||||||||||
| 100 | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 24 |
| 200 | 4 | 8 | 12 | 16 | 20 | 24 | 28 | 32 | 36 | 40 | 44 | 48 |
| 300 | 6 | 12 | 18 | 24 | 30 | 36 | 42 | 48 | 54 | 60 | 66 | 72 |
| 400 | 8 | 16 | 24 | 32 | 40 | 48 | 56 | 64 | 72 | 80 | 88 | 96 |
| 500 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 110 | 120 |
| 600 | 12 | 24 | 36 | 48 | 60 | 72 | 84 | 96 | 108 | 120 | 132 | 144 |
| 700 | 14 | 28 | 42 | 56 | 70 | 84 | 98 | 112 | 126 | 140 | 154 | 168 |
| 800 | 16 | 32 | 48 | 64 | 80 | 96 | 112 | 128 | 144 | 160 | 176 | 192 |
| 900 | 18 | 36 | 54 | 72 | 90 | 108 | 126 | 144 | 162 | 180 | 198 | 216 |
| 1000 | 20 | 40 | 60 | 80 | 100 | 120 | 140 | 160 | 180 | 200 | 220 | 240 |
| 1100 | 22 | 44 | 66 | 88 | 110 | 132 | 154 | 176 | 198 | 220 | 242 | 264 |
| 1200 | 24 | 48 | 72 | 96 | 120 | 144 | 168 | 192 | 216 | 240 | 264 | 288 |
Recommended protective devices of Duct Heater
- Air-flow switch: Installed on the inlet side of the duct heaters, air-flow switches prevent the energizing of heaters when there is no air flow.
- Over temperature Protection: A type “K” high limit thermocouple attached to one of the heating elements monitors the temperature. The thermocouple is attached to a controller that has a manual reset.
- Fan interlock: To prevent heater from energizing when the fan is not running, the fan starter circuit is interlocked with the heater controls. A time delay can be incorporated in order to keep the fan running after the heater gets de-energized.
Typical Heating Applications OF DUCT HEATER:
- Paint Drying
- Industrial Ovens
- Dehumidification
- Batch-Heating Ovens
- Forced-Air Drying/Curing
- Heat-Treating, up to 1100°F (570°C)
Standard construction for medium temperature duct heaters
(Outlet temperatures up to 750°F)
- Incoloy sheathed heating elements
- General purpose terminal enclosure (NEMA 1)
- Mild steel mounting plate, keeper plate and support hardware
Standard Duct heaters for outlet temperatures up to 750°
| Cat. No. | KW | A (in) | B (in) | C (in) | Approx. WT (lbs) |
|---|---|---|---|---|---|
| FHIL6 | 6 | 6 | 16 | 4.5 | 15 |
| FHIL12 | 12 | 9 | 16 | 7.5 | 30 |
| FHIL18 | 18 | 12 | 16 | 10.5 | 44 |
| FHIL24 | 24 | 15 | 16 | 13.5 | 62 |
| FHIL30 | 30 | 18 | 16 | 16.5 | 76 |
| FHIL36 | 36 | 21 | 16 | 19.5 | 90 |
| FHIL42 | 42 | 24 | 16 | 22.5 | 106 |
| FHIL48 | 48 | 27 | 16 | 25.5 | 118 |
| FHIL54 | 54 | 30 | 16 | 28.5 | 137 |
| FHIL60 | 60 | 33 | 16 | 31.5 | 152 |
Standard construction for high temperature duct heaters
(Outlet temperatures up to 1100°F)
- Incoloy sheathed heating elements
- Reduced watt density on tubular sheath
- General purpose terminal enclosure (NEMA 1)
- 2" mineral wool insulation under the mounting flange
- Stainless steel mounting plate, keeper plate and support hardware
Standard Duct heaters for outlet temperatures up to 750°
| Cat. No. | KW | A (in) | B (in) | C (in) | Approx. WT (lbs) |
|---|---|---|---|---|---|
| FHIH6 | 6 | 6 | 20 | 4.5 | 16 |
| FHIH12 | 12 | 9 | 20 | 7.5 | 31 |
| FHIH18 | 18 | 12 | 20 | 10.5 | 46 |
| FHIH24 | 24 | 15 | 20 | 13.5 | 64 |
| FHIH30 | 30 | 18 | 20 | 16.5 | 78 |
| FHIH36 | 36 | 21 | 20 | 19.5 | 93 |
| FHIH42 | 42 | 24 | 20 | 22.5 | 109 |
| FHIH48 | 48 | 27 | 20 | 25.5 | 122 |
| FHIH54 | 54 | 30 | 20 | 28.5 | 141 |
| FHIH60 | 60 | 33 | 20 | 31.5 | 156 |
- Air-flow switch: Installed on the inlet side of the duct heaters, air-flow switches prevent the energizing of heaters when there is no air flow.
- Over temperature Protection: A type “K” high limit thermocouple attached to one of the heating elements monitors the temperature. The thermocouple is attached to a controller that has a manual reset.
- Fan interlock: To prevent heater from energizing when the fan is not running, the fan starter circuit is interlocked with the heater controls. A time delay can be incorporated in order to keep the fan running after the heater gets de-energized.
Features of DUCT HEATERS
- Weatherproof terminal enclosure (NEMA 4)
- Airtight sealed joint between element and mounting flange
- 3" mineral wool insulation inside the terminal box (Box height will increase to 7”)
- Air-flow switch
- Stainless steel terminal enclosure
- Process control thermocouple
- High-limit thermocouple
