Uses of Duct Heater in HVAC and Building Construction

Uses of Duct Heater in HVAC and Building Construction

Duct heaters, as the name suggests, are typically intended to be mounted inside ducting. They are usually mounted through the sidewall to heat the air in the tube as it passes through the open-coil components.

Heating and air-conditioning (HVAC) technologies are used to heat and extraordinary homes, businesses, and industries. HVAC can help dilute airborne toxins by supplying fresh, natural air and ensuring the comfort of people who live in these spaces. Duct Heaters are used for ventilation in a variety of business and commercial applications.

Heating and Air Conditioning systems often have simple construction features such as an external exhaust system and an air handler, including a fan assembly, heating and air conditioning coils, and exhaust systems. There is also an air circulation and exhaust scheme.

Uses of the electrical duct heater

The duct system is a component of the air distribution system that provides a regulated route for air to circulate within the home, warehouse building, or warehouse. It is made up of a network of circular or rectangular tubes made of sheet metal, fibreglass duct board, or reinforced plastic. These tubes can be seen in the frames, floors, and ceilings.

The electrical duct heater, which runs on electricity to heat the airflow that flows through a tube, is an essential component of the duct system. It consists of a heating unit that transforms electricity in resistance into heat. The resulting heat is transmitted to the air moving through the system through energy transfer. These duct heaters are suitable for room, secondary, and primary ventilation.

Electrical duct heaters are especially appreciated for their contribution to energy conservation in cold rooms.

 These devices control temperatures and dynamically adjust heat output to keep the open coil portion at the optimum temperature. Electric duct & flexible heaters may be designed to heat a particular region at a specific time. This helps in effective heat transfer while wasting time and energy since the atmosphere or space is only heated when necessary.

Electric duct heaters can supplement home and office warming by preheating fresh or returning air. The majority of modern electric duct heaters have a modulating controller, which allows them to operate in incredibly low airflow conditions without sacrificing output.

Installation and Functions

These instruments may be mounted in the ceilings of office towers, classrooms, churches, shipboard accommodations, and other institutions. They can also be used in power stations, wastewater treatment plants, and office buildings.

Duct heaters are relatively simple to build, whether for a new unit or to replace an existing one, since each heater is built to a certain dimension, wattage, and voltage. Welding or flanges may be used for mounting.

Most electrical duct heaters have features such as an airflow cut-off switch to maintain even airflow through heating components. The device changes whether one part absorbs too much or too little air. Another common feature is an automated, main thermal cut-off, which will shut down the device when the temperatures cap is reached.

Electric vent heaters are also available for use in dangerous environments. Thermal control is provided by these heaters, which are used in applications such as shipbuilding, chemical and petroleum chemical applications, and so on.


Airflow control: Airflow controls, which are mounted on the inlet side of duct heaters, keep heaters from turning on while there is no airflow.

Overheating Protection: The temperature is monitored by a form “K” high limit temperature sensor connected to heating elements. The thermocouple is connected to a controller with a manual reset button.

Fan interlock: The fan starting circuit is enclosed with the heater controls to keep the heater from energising when the fan is not working. A time delay can be used to keep the fan going until the heater has been turned off.

Concerns On Installation

The alignment of the heater concerning the direction of the coils is the main consideration when installing a duct heater. The coil orientation must be horizontal. That is, the heater’s terminating plate is attached to a vertical side of the vent.

Horizontal installation ensures that acrylic bushings properly protect the coils. If the heater is placed vertically, the coils may sag to the point of short selling the coil wrapping together. They might even fall out of the “bottom” bushing and fall to the ductwork.

If several heaters are needed for the application, avoiding mounting them closely beside each other. Instead, space them out by at least a few inches. This helps the air to merge or blend until it comes into contact with the next bank of heater coils.

When installing a thermocouple downwards, please keep it away from the heater for the same reasons mentioned above. Temperature sensors should also be long enough to penetrate far enough into the vent, away from less air near the wall.


Bucan was founded as a small family company for the plastics business in 1985 that primarily produces cartridge heating systems and mica band heaters. Over the decades, Bucan has expanded its product range to include manufacturing process heaters, Cartridge heaters, temperature controls and control panels by continuous research and development. We are currently serving a variety of sectors, not limited to, including even: the petrochemical, biomedical and hydroelectric industries.


At Bucan our support personnel, technical units, and manufacturing cells have established an exceptional team spirit so that we can develop and produce thermal applications that quickly fulfil your needs.