Also Known As :
A duct heater is a type of heating equipment used in HVAC (Heating, Ventilation, and Air Conditioning) systems. Its primary purpose is to heat the air that passes through the ducts of a building or space.

About :
A duct heater is installed within the ductwork of an HVAC system. It uses electric heating elements or a heat exchanger (in systems with a furnace or boiler) to warm the air as it flows through the ducts.

Features :
• This Packaged Duct Heater is made using a galvanized steel compartment.
• 1/2" fiberglass insulation and hinged cover.
• Features door interlock disconnect switch, primary automatic reset temperature limit control and load carrying secondary over temperature protective device.
• Includes definite purpose magnetic contactor, differential pressure fan interlock switch. • 24V step down transformer.
• Permanently attached wiring diagram on inside of terminal compartment cover. • Galvanized steel element rack must always be 1" shorter than duct height and 1/2" shorter than duct width to allow insertion clearance.
• UL listed.

Types:

Electric Duct Heaters: These heaters use electric heating elements to heat the air. They're typically used in systems where there's no central furnace or boiler.
Hot Water or Steam Duct Heaters: These utilize a heat exchanger through which hot water or steam from a boiler passes, transferring heat to the air in the ducts.
Applications: Duct heaters are used in various settings, including residential, commercial, and industrial buildings. They are particularly useful in situations where additional heating is needed for specific areas or when central heating is not available or insufficient.

Control: They are usually controlled by thermostats and sensors to maintain desired air temperatures. These controls can be part of a larger building management system for efficient energy use.

Installation: Proper installation is crucial for efficient operation and safety. Duct heaters must be correctly sized for the ductwork and the heating needs of the space.

Safety Features: Modern duct heaters often come with safety features like overheat protection to prevent fire hazards and damage to the HVAC system.