Duct Heaters

Air Process Heater Duct air heater
Duct and Air Process Heaters


Duct heaters from National Plastic Heater are composed of, tubular, finned tubular or open coil heating elements that are either flanged or inserted in the duct. A duct air heater is generally an assembly of tubular heating elements ready to mount into a duct but it can also be an open-coil resistance wire assembly mounted into a duct. Tubular Heating of proper rating, material and shape can be used in most heating applications. Finned Tubular Air Heaters are designed to suit particular applications. There features include: steel sheath material, high quality MGO compacted to provide maximum heat conductivity and optimum dielectric strength, 80/20 resistance wire sized to provide the lowest watt density giving long superior life. Duct Heaters are used in a variety of air and gas heating applications. These are intended to be installed in existing ducting and can be mounted in any direction. Thermostats, thermocouples and high limit switches can be incorporated.

Industrial Duct Air Heaters | Duct Air Heaters Duct Heaters Air Process Heaters Specifications.pdf

Industrial Duct Air Heaters | Duct Air Heaters Duct Heaters Air Heaters Wiring Diagrams.pdf

Forced Air Duct Heater - for Industrial Process Heating Only

Ovens often require re-circulated air, or forced circulation, to perform the desired heating task. A duct heater mounted in this re-circulated air stream is an effective way to provide this heat, without having any electrical connections inside your oven.

Typical Applications

heat treating, up to1000�F (540�C)



Industrial Duct Air Heaters | Duct Air Heaters drying

batch heating

conveyor systems

Typical Air Heat Calculation

kW =

SCFM x temperature rise

kW - kilowatts
SCFM - standard cubic feet per minute
Temperature rise - number of degrees Fahrenheit increase required

Typical Options and Features for Duct Heaters:

NEMA 1 or NEMA 4 electrical enclosures

Industrial Duct Air Heaters | Duct Air Heaters 304 or 316 stainless steel flange

stainless steel or Incoloy sheath materials

Hi temperature limit thermocouples

purged electrical enclosures for hazardous areas

Telephone: 905-859-8225 Facsimile: 905-859-4691

How To Order Duct, Air Process Heaters

Specify the following measurements by referring to sketch above:
Specify for:
Specify Sheath Material:
Specify terminal housing:
Specify temperature sensor type:
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UL Registered Firm World Wide Shipping CSA US
We Ship Our Industrial Process Heaters To OEM’s & Industry World Wide.

Inquiries & Technical Support

Telephone: 905-859-8225 Facsimile: 905-859-4691

[email protected]

Toll Free: 1-877-674-9744