Fläkt Woods 500mm Long Cased Axial Flow Extract Fan - Single Phase 50JM/20/4/6/32 – EJ511466
Engineered for exceptional performance in commercial and industrial ventilation systems, the Fläkt Woods 50JM/20/4/6/32 features the innovative JM Aerofoil impeller for outstanding aerodynamic efficiency and low noise levels. Designed to meet modern energy and acoustic requirements, this unit is a premium solution for ducted installations demanding reliable, high-capacity airflow.
Core Benefits
High-Efficiency Aerofoil Impeller: Delivers up to 77% efficiency and reduced Specific Fan Power (SFP)
Precision Performance: Adjustable pitch blades provide tailored airflow settings
Versatile Installation: Available in both long and short case formats for maximum flexibility
Extensive Range: Suitable for fan diameters from 315 to 1600mm, with air volumes up to 186,500 m³/h and pressures up to 2400 Pa
Tested to Standards: Conforms to ISO 5801 and BS848 for airflow, and ISO 5136 for acoustic testing
Technical Specifications
Max Airflow: 8,676 m³/h
Motor Power: 680 W
RPM: 1,420
Current Draw: 4.8 A
Temperature Range: -40°C to +50°C
Weight: 43.0 kg
Impeller Assembly
Blade Design: Bespoke aerofoil profile for enhanced efficiency and low noise
Hub Construction: Profiled clamp plates and steel inserts provide secure, adjustable fixing
Manufacture: Precision die-cast aluminium (X-ray inspected)
Balance: ISO 14694 (Grade G16 to G2.5)
Torque Fixing: Key and keyway per BS 4235:1972
Operating Form:
Form B (Standard): Airflow through impeller, over motor
Form A available upon request
Non-Overloading: Ensures motor power is never exceeded during normal operation
Casing Design
Material: Mild steel to BS EN 10111 Grade DD11
Construction: Fully welded seams with pre-drilled integral flanges
Finish: Hot-dip galvanised to BS EN ISO 1461 for corrosion resistance
Long Case Configuration: Includes duct-mounted terminal box and inspection port
Short Case Option: Available without terminal box/sight port for compact installations
Duct Compatibility: Flange fixings to BS EN ISO 13351
Motor Features
Type: Squirrel cage induction motor, S1 continuous duty
Ratings: Fully compliant with IEC 60034-1 (installed conditions)
Ingress Protection: IP55 with drain plug
Start-Up Temperatures: Rated for starts above -20°C
Voltage Options:
220–240V / 60Hz (1Ø)
400V / 60Hz (3Ø)
440–480V / 60Hz (3Ø)
Other variants on request
Speed Control: Inverter-ready; electronic and transformer control options available
Bearings: Ball or roller type with 20,000-hour L10 life (ISO 281)
Motor Finish: Aluminium (self-finish) or cast iron (painted)
Performance & Testing
Airflow Testing: Conducted in AMCA-accredited Woods lab to ISO 5801 standards (Type D, ducted)
Noise Testing: Acoustic performance verified to ISO 5136 in ducted conditions
Reversible Airflow: Designed for forward and reverse operation; stress-tested under both modes
Note: Not all configurations support reverse operation at maximum speed – consult before use
Our JM Axial Fan Product Range
PRODUCT REFERENCE EXAMPLE: 63JM/20/4/6/36
63 - denotes the fan impeller diameter in centimetres
JM - denotes fan type
20 - denotes impeller hub diameter in centimetres
4 - denotes a nominal 4 pole speed
6 - denotes the number of blades
36 - denotes the pitch angle for the required duty
The Fläkt Woods JM Aerofoil range is built to meet the demands of today’s performance-focused, energy-conscious installations. For specification support or reverse-operation suitability, get in touch with our technical team.