Dundar CM 21.2 Radial Snail Fan Aspirator (Single Phase) 2500 m³ 2700 RPM

Radial Fan

Radial fans are fans that create pressure differences. The air generated works in the direction of centrifugal force. A centrifugal fan is a mechanical device used to move air or other gases. These fans have a rotating wheel, similar to a pump, and a helical housing for the wheel. Air or gas enters from the center parallel to the axis, is pressurized, transferred tangentially to the wheel, and expelled through the outlet. Due to their high-pressure capabilities, centrifugal fans are ideal for high-pressure applications such as drying and air conditioning systems. Since all moving parts are enclosed, they are also suitable for use in air pollution and filtration systems, reducing particle ingress.

Radial Fan Applications

• Where axial fans are insufficient in pressure and flow,
• In duct applications,
• In solid fuel boiler systems,
• In areas with high air temperatures for hot air discharge,
• In general and industrial buildings,
• Warehouses, storage, and warehouse areas,
• Garages and public buildings, agricultural buildings,
• Commercial greenhouses,
• Large workshops,
• Paint booths,
• Factories,
• Environments with dust and vapor,
• For cooling industrial machinery
  (welding machines, transformers, compressors, etc.).

Radial Fan Housing and Blades

• High-quality cold-rolled steel radial housing,
• Eco-friendly and corrosion-resistant electrostatic epoxy powder coating,
• Galvanized forward curved radial blades tested according to ISO 1940 dynamic balance standards,
• High pressure and flow values with nozzle application at intake,
• Strong and smooth housing structure with special riveted housing joining,
• Low Noise Level,
• Right and Left mounting options for desired direction,

Radial Fan Motor

• High-quality production with CNC machines,
• High heat conduction aluminum fan motor body,
• Long bearing life with ISO 1940 balanced rotor,
• Insulation class F for coils with a wide operating range of -40° to +70°,
• 230 V / 50 Hz Single-phase Fan Motor,
• 400 V / 50 Hz Three-phase Fan Motor,
• Certified components complying with standards,
• IP 54 Protection Class (optional IP 55 production available),
• Inverter control can be used in three-phase fans.

Considerations for Fan Selection

Four parameters should be considered when selecting a fan:

• Required Air Flow
• Pressure Losses
• Acceptable Noise Level
• Electrical Power Connection Type

The required air exchange for the environment; the purpose of use, the number of people and equipment inside, and their activities are important. The following table provides necessary air exchange ratios for different environments:

Environment	Air Exchange Ratio
Auditoriums	6-8
Paint Booths	25-50
Vault Rooms	3-6
Cinemas and Theaters	5-8
Commercial Kitchens	15-30
Foundries	8-15
Gymnasiums	4-6
Laundries	10-20
Indoor Pools	3-4
Restaurants	8-12
Conference Rooms	6-8
Waiting Rooms	10-15
Machinery Rooms	10-40
Shops	4-8
Dry Cleaners	5-15
General Manufacturing Areas	4-8
Hospitals	8-12
Laboratories	8-15

Based on the information above, the required air flow can be calculated as:
$Q [m³/hour] = Air Exchange Coefficient (1 hour) × Room Volume (m³)$
or
$Q [m³/hour] = Number of People × Per Person Required Air Flow$

After determining the required air flow, an appropriate duct design should be made considering noise and air velocity criteria, and pressure losses should be calculated. Depending on the environment where the fan will operate, the fan type (axial, radial, rooftop, smoke exhaust, etc.) should be selected based on the determined flow-static pressure pair, and an appropriate fan curve should be chosen.