AL ATEX DUST – explosion-proof centrifugal fans for combustible dust atmospheres ≤11200 m³/h

AL ATEX DUST – explosion-proof centrifugal fans

AL ATEX DUST industrial centrifugal fans with forward-curved Sirocco-type impeller blades are designed for ducted ventilation systems installed in potentially explosive combustible dust atmospheres. Suitable for ATEX Zone 21, they comply with Directive 2014/34/EU and carry the marking II 2D Ex h IIIB T135°C Db. The manufacturer's declared series airflow range is 1500–11200 m³/h, with pressures up to 1900 Pa.

Main features

• ATEX construction for combustible dust atmospheres, Zone 21, equipment category II 2D.
• Fan ATEX marking: II 2D Ex h IIIB T135°C Db.
• Type Examination Statement IMQ 10 ATEX 017 X.
• Applicable standards EN 14986:2017, EN 1127-1, EN ISO 80079-36 and EN ISO 80079-37.
• Designed to convey clean air in industrial ducted installations requiring high pressure.
• Volute casing manufactured from steel sheet with protective epoxy-polyester powder coating.
• Single-inlet Sirocco-type impeller with forward-curved blades.
• Galvanised steel impellers for sizes 200–315; welded and painted steel impellers for sizes 355–450.
• Painted steel sheet inlet cone.
• Direct drive, arrangement 4 construction.
• Explosion-protected single-phase or three-phase asynchronous motors for combustible dust atmospheres.
• Motor enclosure protection IP66, insulation class F and continuous duty S1.
• Motor dust group IIIC, protection by enclosure „tb“ according to IEC 60079-0 and IEC 60079-31.
• PTC thermistors for motor overheating protection.
• Speed control of three-phase motors using a suitable frequency inverter in accordance with manufacturer requirements.
• Conveyed air temperature from -20 °C to +60 °C; from -40 °C to +60 °C on request.
• 60 Hz versions and temperature classes T5 or T6 available on request.

The motor's IIIC „tb“ classification must not be confused with the complete fan's IIIB ATEX classification.

Fan casing orientations

Standard discharge orientation LG270°. The casing can be rotated in 45° increments. Orientations of 180° and 225° require special factory construction.

Optional accessories

• Round inlet adaptor.
• Inlet protection guard.
• Outlet protection guard.

Accessories are not included in the Type Examination Statement. Their suitability for the specific ATEX installation must be assessed separately.

AL ATEX DUST – technical catalogue (PDF)

AL ATEX DUST – dimensions

All dimensions are in millimetres (mm); indicative weights are in kilograms (kg). Symbols correspond to the manufacturer's dimensional drawing.

Connection and mounting dimensions

Dimensional drawing

The illustration shows the dimension symbols. AL ATEX DUST values must be taken from the tables above and the manufacturer's catalogue.

Original AL ATEX DUST dimensional drawing (PDF, page 6)

AL ATEX DUST – technical information

AL ATEX DUST – model specifications

Qmax is the maximum permissible airflow. Pt min is the minimum operating total pressure, not the fan's maximum pressure.

* For models 284 A/B and 314 A/B the catalogue provides common operational limit values for each model group. Each variant must be selected using its own performance characteristics.

Air performance measured according to EN ISO 5801 / AMCA 210 at an air density of 1.2 kg/m³.

AL ATEX DUST – manufacturer's technical catalogue (PDF)

AL ATEX DUST – installation instructions

AL ATEX DUST centrifugal fans are intended for industrial ducted ventilation systems installed in potentially explosive combustible dust atmospheres. Before installation, verify that the equipment's ATEX classification is suitable for the designated hazardous area.

Mounting

• Secure the fan to a rigid supporting structure suitable for its weight and operating loads.
• Provide access to the motor, casing and maintenance points.
• Prevent ductwork from transmitting excessive mechanical loads to the casing.
• Before commissioning, inspect the mounting fasteners and make sure the impeller rotates freely.

Duct system and airflow

Forward-curved centrifugal fans must operate connected to ductwork or with sufficient additional aerodynamic resistance, such as balancing dampers. System resistance must limit airflow so that the absorbed motor current does not exceed the permissible value stated on the motor rating plate.

Casing orientation

The standard discharge orientation is LG270°. The casing can be rotated in 45° increments, excluding the 180° and 225° positions which require special factory construction.

Electrical connection

• Connect the electrical supply according to the motor rating plate and applicable ATEX requirements.
• Ensure protective earthing and suitable protection of electrical connections.
• Connect the PTC thermistors to a suitable motor thermal protection circuit.
• Use frequency inverter speed control of three-phase motors only under conditions approved by the manufacturer.

Commissioning

• Check impeller rotation direction and freedom of movement.
• Inspect duct connections and protective components.
• Measure the absorbed motor current and compare it with the rated value.
• Check for abnormal vibration, noise and motor overheating.
• Do not exceed the specified airflow and temperature limits.

Maintenance

Regularly inspect the casing, impeller, motor and protective devices. Prevent deposits of combustible dust. Before maintenance, isolate the electrical supply, protect against accidental restart and follow safety procedures applicable to explosive atmospheres.

AL ATEX DUST – manufacturer's technical catalogue (PDF)