Axial fan TCBT/4 EX ATEX 710/HB ducted, in explosion-proof version 41521165

Safe Ventilation in Explosive Atmospheres

The TCBT/4 EX ATEX 710/HB axial duct fan is a specialized device designed for installations where standard solutions do not meet safety requirements. This is an explosion-proof (ATEX) version from the COMPACT series, enabling safe air exchange in spaces hazardous due to gases, vapors, or dusts. The unit features a large impeller diameter of 710 mm and an HB-type construction, meaning airflow moves from the impeller toward the motor – a design that protects the drive unit from direct contact with the conveyed medium.

Thanks to certification in accordance with the ATEX Directive (94/9/EC), this model can be used in zones 1 and 2 (for gases) and zones 21 and 22 (for dusts). The designation II 2G Ex h IIB T4 or II 3D c T125°C (depending on the exact order specification for this size) guarantees that the device will not become an ignition source even in the presence of an explosive atmosphere. This is critical for chemical plants, paint shops, warehouses storing flammable materials, or industrial facilities where dust or vapors are unavoidable.

Construction and Resistance to Harsh Conditions

The fan housing is made of steel sheet, subjected to cathodic electrocoating with primer and polyester paint. Such protection ensures high corrosion resistance, which is essential in industrial environments with elevated humidity or the presence of aggressive chemical substances. The impeller, made of aluminum sheet, is dynamically balanced according to ISO 1940-1. This ensures quiet and stable operation, minimizing vibrations transmitted to the duct system.

The electric motor in this model has insulation class F and protection rating IP55 (for ATEX versions), allowing operation in harsh environmental conditions without risk of damage from dust or water jets. The fan handles media with temperatures ranging from -20°C to +40°C (for size 710 mm), making it a universal solution for both general and technological ventilation systems. Installation is possible in horizontal or vertical positions, facilitating integration with existing ventilation systems of various spatial configurations.

Applications and Operational Benefits

The device is used where continuous air circulation must be ensured while maintaining the highest explosion-protection safety standards. Typical scenarios include:

• Ventilation of production halls in the chemical and petrochemical industries.
• Vapor extraction systems in paint shops and plastic processing plants.
• Warehouses storing flammable materials and chemical storage facilities.
• Public facilities and underground garages requiring specialized ATEX protection.

Key advantages resulting from the design of the TCBT/4 EX ATEX 710/HB model:

• Safety: The ATEX certificate eliminates the risk of igniting a hazardous zone via sparks or hot surfaces from the device.
• Durability: Cathodic electrocoating and stainless steel components (at contact points) ensure long service life even under intensive use.
• Mounting Versatility: The possibility of horizontal and vertical installation simplifies the design of ventilation systems with complex geometries.
• Motor Protection: The HB flow configuration protects the drive from direct contact with the working medium, extending the device's lifespan.

For proper installation, the device dimensions must be considered: the duct connection diameter is exactly 710 mm, while the external housing diameter exceeds this value up to 806 mm. The total length of the device for version H is approximately 770 mm, and the terminal box is located at a height of about 444 mm from the mounting base (this value may vary slightly depending on the exact version). Installation requires preparation of a mounting hole with 16 screw holes. Please note that for 710 mm diameter models, the upper operating temperature limit is +40°C, which must be taken into account when designing systems for exhausting hot process gases. In cases where flow regulation is required, three-phase motors can be controlled via frequency inverters (provided the manufacturer permits such modification for the specific ATEX version), which allows