Dündar CM 18.2 Radial Snail Fan Aspirator (Single Phase) 1625 m³ 2650 RPM

What is a Radial Fan?

Radial fans are fans that create pressure differences. The air generated operates in the direction of the centrifugal force (centrifugal force). A centrifugal fan is a mechanical device used to move air or other gases. These fans feature a rotating wheel, similar to a pump, and a spiral housing in which the wheel is located. Air or gas enters centrally and is pressurized, then transferred radially through channels tangential to the wheel, and expelled through the discharge outlet. Due to the high pressures they generate, centrifugal fans are ideal for high-pressure applications such as drying and air conditioning systems. Their closed moving parts make them suitable for use in air pollution and filtration systems, reducing particles.

Applications of Radial Fans

• In duct applications where axial fans fall short in pressure and flow
• In solid fuel boiler systems
• For exhausting high-temperature air
• In general and industrial buildings
• Warehouses and storage areas
• Garages and public buildings
• Agricultural buildings
• Commercial greenhouses
• Large workshops
• Painting facilities
• Factories
• Environments with dust and vapor
• Cooling industrial machines (e.g., welding machines, transformers, compressors, etc.)

Radial Fan Casing and Impellers

• Radial casing made from high-quality cold-drawn steel sheet
• Environmentally friendly and corrosion-resistant electrostatic epoxy powder coating
• Galvanized forward-radiating radial impeller tested according to ISO 1940 standards
• High-pressure and flow rates with nozzle application at the inlet
• Robust and smooth casing structure with special joint casing assembly
• Low Noise Level
• Right and left-hand mounting options for desired orientation

Radial Fan Motors

• High-quality production with advanced CNC machines, no human intervention
• High heat transfer capacity aluminum framed motor housing
• Long bearing life with rotor dynamically balanced according to ISO 1940 standards
• Insulation class F, with a wide operating range from -40° to +70°
• Single-phase Fan Motor: 230 V / 50 Hz
• Three-phase Fan Motor: 400 V / 50 Hz
• Certified components compliant with standards
• IP 54 Protection Class (optional IP 55 production available)
• Ability to use inverter control (drive control) for three-phase fans

Considerations for Fan Selection

When selecting a fan, four key parameters should be considered:

• Required Airflow
• Pressure Losses
• Acceptable Noise Level
• Electrical Power Connection Type

The required air change rate for a ventilated space depends on its intended use, the number of occupants, and activities within. Below, different environments and their required air change coefficients are provided.

Environment	Air Change Coefficient
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
Laundry Rooms	10-20
Indoor Pools	3-4
Restaurants	8-12
Conference Rooms	6-8
Waiting Rooms / Copy Rooms / Machine Rooms	10-40
Shops	4-8
Dry Cleaning	5-15
General Manufacturing Areas	4-8
Hospitals	8-12
Laboratories	8-15

For normal activity (non-smoking), 29 m³/hour is required per person. For normal activity (smoking), 58 m³/hour is required per person. For light activity, 45 m³/hour is needed per person. For heavy industrial activities, 60 m³/hour is necessary per person.

Based on the provided information, the required airflow is determined as follows:
Q [m³/hour] = Air change coefficient (per hour) * Room volume (m³)
or
Q [m³/hour] = Number of people * airflow requirement per person

Once the required airflow is determined, a suitable duct design must be made (considering sound and airflow velocity criteria), and pressure losses should be calculated. Depending on the environment, the appropriate fan type (axial, radial, roof, smoke exhaust, etc.) should be selected, and the correct fan curve based on the determined airflow-static pressure pair should be chosen. For example, considering an office with 5 people, a ceiling height of 2.6 meters, and a floor area of 50 m², the total volume is 2.6 * 50 = 130 m³. Using the air change coefficient table for offices (4-8), if 5 is considered, the airflow requirement would be 130 * 5 = 650 m³/h. Assuming normal activity, 5 people * 29 m³ = 145 m³ airflow is needed, leading to a total airflow requirement of 650 + 145 = 795 m³/hour. The fan selection should be made according to this airflow requirement.