NC-type heater

Product Overview:
Our company’s explosion-proof fan heaters are safety‑rated heating devices specially designed for high‑risk industrial environments—such as petroleum, chemical, pharmaceutical, and coal‑mining facilities—where flammable and explosive gases or dusts are present. Powered by hot water or steam as the heat transfer medium and equipped with explosion‑proof axial fans, these units strictly comply with the GB 3836 series of explosion‑proof standards, ensuring safe operation in explosive gas atmospheres. They deliver efficient convective heating, effectively addressing winter heating and freeze‑protection challenges in hazardous settings.
Main functions of the Products:
Safe Heating in High-Risk Scenarios: The core electrical components feature an explosion-proof, flameproof design (typically meeting or exceeding the Ex d IIB T4 Gb rating), with the motor and junction box fully sealed to effectively prevent internal electrical sparks from coming into contact with external flammable and explosive atmospheres, ensuring safe heating in hazardous environments.
High-efficiency convective heat transfer: It employs steel finned-tube radiators, using hot water or steam as the heat transfer medium, and relies on explosion-proof axial fans to forcibly circulate air, rapidly heating it and evenly distributing it throughout the indoor space, thereby addressing the heating and equipment freeze‑protection needs of large‑area facilities such as factories and warehouses.
Constant Temperature and Energy-Saving Operation: An explosion-proof thermostat is available as an optional accessory, enabling automatic temperature control and timed start/stop functions to prevent overheating. Featuring a single‑pass flow configuration with air entering from the top and exiting from the bottom, it efficiently drains condensate and minimizes heat loss, delivering substantial energy savings compared with conventional heating systems.
Air Circulation and Dehumidification: It promotes continuous air circulation indoors, suppresses the accumulation of cold air, reduces condensation and moisture on walls and equipment, and simultaneously lowers the localized concentration of flammable and explosive gases, thereby enhancing site safety.
Multi-scenario compatible installation: It supports multiple installation methods, including horizontal wall mounting and ceiling suspension, without occupying floor space, and is compatible with various installation locations such as factory mezzanines and rooftops, meeting the heating needs of complex industrial environments.

Core Technical Specifications (Reference for Standard Explosion-Proof Hot-Water/Steam Air Heaters):

Note: For steam‑type models, the heating capacity increases as steam pressure rises (0.2–0.6 MPa); certain models can be customized to higher explosion‑proof ratings (e.g., Ex d IIC T4, suitable for environments containing highly hazardous gases such as hydrogen).

Additional Notes and Key Usage Points:
Key considerations for explosion-proof selection:

It is essential to select equipment with the appropriate explosion-proof rating based on the hazardous gas category and temperature class of the installation site. For example, in chemical processing environments, Ex d IIB T4 is typically chosen, while underground coal mines require equipment rated for mining‑specific explosion protection.
Installation and Maintenance Requirements:
1. Installation must be performed by personnel qualified to install explosion-proof electrical equipment, in strict compliance with the GB 3836 standard.
2. Regularly clean dust from the finned tubes and inspect the sealing integrity of the explosion-proof junction box to prevent dust accumulation from compromising heat dissipation and explosion-proof performance.
3. Equipment must be reliably grounded to prevent the buildup of static electricity.
Safety Precautions:
1. It is strictly prohibited to open the explosion-proof junction box or enclosure while the equipment is in operation.
2. Overpressure operation is strictly prohibited; the heat-transfer fluid pressure must be maintained at the rated working pressure.
3. When used in flammable and explosive dust environments, the fan impeller and the interior of the housing must be cleaned regularly to remove accumulated dust.

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