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:: Air Duct Heaters ::
Process Air Duct Heaters:
Matrusree duct heaters are ideal solutions for a variety of applications, including primary heating, supplementary heating (i.e., supporting a heat pump), auxiliary heating, humidity control or multi-zone heating. We offer a line of standard products as well as heaters custom-built to your specifications. Matrusree allows immediate design changes when our customers request them.

Duct Heater designs consist of heavy duty. 430'' diameter tubular heaters formed into a hairpin and mounted to a heavy gauge steel frame. The elements are held in place by a quick-release removable bracket, providing easy field replacement of failed elements.

Terminal housing with a steel perforated cover provides element wiring protection and aids cooling.

Terminals and electrical wiring are insulated from the process temperature by 4" of mineral insulation located at the retainer box between the heated element section and the terminal housing. A built-in thermowell for a 1/4" diameter thermocouple provides element sheath temperature surveillance to prevent over-temperature conditions.
Sturdy 0.430" diameter tubular elements mounted to a heavy 14" or 38" thick steel flange. Terminal housing made of 18 gage aluminized steel. Element support plates of 16 gage aluminized steel are held in place by stainless steel support rods. High temperature units have the additional feature of stainless steel material for the 3" insulation housing and element support plate-all of which provides superior rigidity, strength and reliability. Long life metal sheath tubular elements-Corrosion/oxidation resistant sheath. High grade Incoloy sheath material for excellent corrosion/oxidation resistance at high operating temperatures.

Duct Heaters are rugged, compact and dependable, providing cleaner and safer low pressure heated air through forced air ducts at maximum temperatures of 750°F (399°C). Typical applications are ovens, curing and drying processes.
Electrical duct heaters are applicable in many areas, such as air handling units, offshore, chemical and petrochemical installations, ship construction and process industry. All heaters are designed for both indoor and outdoor use
We have developed a variation of our standard finned tube air heater to be installed in corrosive environments, such as platforms, chemical, petrochemical and offshore plants. This heater is made of stainless steel 316.
A steel tube is welded to the junction box. The steel tube is provided with rolled fins of steel which guarantees the highest efficiency in heat transfer. A ceramic heating element has been mounted in the tube. The effect is that the surface temperature never exceeds the maximum admissible temperature
Typical Applications:
1 Heat Treating
2. Forced Air Comfort Heating
3. Booster Air Heater
4. Re-Heating
5. Air Drying/Curing Operations
6. Annealing
7. Core Drying
8. Resistor Load Banks
Standard Features:
1. NEMA 1 General Purpose Ventilated Enclosure
2. Painted steel mounting flange
3. Single and Three Phase wiring
4. 3 1/2 inches (89 mm) insulation
5. Field replaceable Incoloy® 840 elements
6. Element bends repressed
7. 1/4" (6 mm) inside diameter thermowell
8. Stainless steel support plate and corner posts
Selecting the appropriate Duct Heater:
1. Establish the requirements of your process heating application. Select the heater assembly type, size, watt density, sheath material and electrical rating best suited for your application.
2. Match the heater watt density (w/in2) to the medium being processed. If the watt density is too high for the application the heater will fail prematurely.
3. Match the sheath material and operating temperature to the medium being processed in order to avoid sheath corrosion.
4. Air flows must never be interrupted. Such events will cause over-heating and/or premature heater burnout. Your installation should include high limit temperature controls.
5. Be sure that the heaters are securely mounted and protected from mechanical damage.
6. Select the terminal housing that provides the best terminal protection from the environment surrounding the application.
7. Thermostats are optional. Select the type and temperature rating required for the application.
8. If practical, heaters shou ld be cleaned periodically in order to extend heater life.
9. If you should encounter any problems in selecting and/or installing a process heater, consult Matrusree for assistance.
1 Maximum watt density of 40 watts/in2 (6.2 watts/cm2).
2 Maximum element sheath temperature of 1400°F (760°C)
3 Minimum air velocity of 200 feet per minute (61 meters per minute)
Minimum Wattage:
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1. MATRUSREE Duct Heaters may be bolted to the ductwork through the side, bottom or top. Bottom and side mounting are preferred to minimize wiring/terminal enclosure temperatures.
2. Before mounting, consideration should be given to the strength of the ductwork required to support the weight of the heater. Add additional hangers or supports as required.
3. The inlet side of the unit should be at least 48 inches downstream from any change in duct size or duct direction.
4. To minimize pressure drop, mount in the duct with the narrow width of the heater perpendicular to the air flow.
5. Duct heaters may be mounted in tandem to increase the KW that can be installed.
6. Process temperature sensing should be located downstream from the duct heater.
7. All standard duct heaters have a thermowell attached to one element for installing a thermocouple to sense element temperature. Additional protection for the heater from low air flow can be achieved by installing an air flow switch or pressure switch on the inlet side.
1. Never perform any type of service on duct heaters prior to cutting off all power supply lines.
2. Periodically check that mounting screws or bolts have not become loose from blower vibration.
3. Periodically check that electrical connections are clean and tight.
4. Failed elements are field replaceable, minimizing downtime and saving the cost of a complete new heater.
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