Dündar CT 21.2 Radial Snail Fan Aspirator (Triple) 2500 m³ 2700 RPM

 

 

 

MODEL	C	D	E	H	L	O	P	S	T
CT 21.2	420	265	360	360	198	220	200	150	169

What is a Radial Fan?

Fans that create a pressure difference are called radial fans. The air effect generated operates 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 impeller, similar to pumps, housed in a helical enclosure. Air or gas enters parallel to the axis at the center, is pressurized, and is transferred tangentially through the impeller to the ducts and expelled out through the discharge outlet.
Due to the high pressure they generate, centrifugal fans are ideal for high-pressure applications such as drying and air conditioning systems. All moving parts are enclosed, making them ideal for use in air pollution and filtration systems due to their particle reduction capabilities.

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Applications of Radial Fans

• In situations where axial fans fall short in terms of pressure and airflow.
• Duct applications.
• Solid fuel boiler systems.
• Hot air exhaust in areas with high air temperature.
• General and industrial buildings.
• Warehouses, depots, and storage areas.
• Garages and public buildings, agricultural structures.
• Commercial greenhouses.
• Large workshops.
• Paint shops.
• Factories.
• Areas with dust and vapor.
• Cooling of industrial machines:
  • (e.g., welding machines, transformers, compressors).

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Radial Fan Body and Impellers

• The radial body is made of high-quality cold-drawn DKP sheet steel.
• Environmentally friendly and resistant to corrosion with electrostatic epoxy powder coating.
• Forward-curved radial impellers are dynamically tested to ISO 1940 standards.
• Manufactured according to EN 60335-2-80 standards.
• High pressure and airflow values are achieved with the suction nozzle application.
• Inlet air is protected by mesh against foreign objects.
• Special body joints ensure robust and uniform body structure.
• Low noise level.
• Right and left mounting options are available for installation in desired directions.

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Radial Fan Motors

• High-quality production with CNC machines without manual intervention.
• Aluminum finned motor body with high heat transfer capacity.
• Rotors balanced to ISO 1940 standards ensure a long bearing life.
• Insulation class: Class F, suitable for working in a wide range of temperatures (-40°C to +70°C).
• Single-phase (230V/50Hz) and three-phase (400V/50Hz) motor options are available.
• Certified components conforming to standards.
• IP 54 protection class (IP 55 available upon request).
• Inverter control (driver control) compatibility in three-phase fans.

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Factors to Consider When Selecting a Fan

Four main parameters should be considered when selecting a fan:

1. Required Airflow (m³/h): Determined by the air exchange needs of the area.
2. Pressure Losses: Includes losses due to ducts, filters, and other system components.
3. Acceptable Noise Level: Varies based on the application environment.
4. Electrical Power Connection Type: Single-phase or three-phase based on the application.

The air exchange requirements depend on the purpose of the space, the number of living beings or objects inside, and their activities. Below is a table of air exchange rates for various environments:

Environment	Air Exchange Rate (per hour)
Auditoriums	6–8
Paint Booths	25–50
Vault Rooms	3–6
Cinemas and Theaters	5–8
Commercial Kitchens	15–30
Foundries	8–15
Gyms	4–6
Laundries	10–20
Indoor Pools	3–4
Restaurants	8–12
Conference Rooms	6–8
Copy Rooms	10–15
Machine Rooms	10–40
Shops	4–8
Dry Cleaners	5–15
General Production Areas	4–8
Hospitals	8–12
Laboratories	8–15

Air requirements based on activity:

• Normal activity (non-smoking): 29 m³/hour per person.
• Normal activity (smoking): 58 m³/hour per person.
• Light activity: 45 m³/hour per person.
• Heavy activity (industrial): 60 m³/hour per person.

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Airflow Calculation Example

To determine the required airflow:
Q (m³/hour) = Air Exchange Rate × Room Volume (m³)
Or:
Q (m³/hour) = Number of People × Air Requirement per Person

For instance, in an office with 5 people, a ceiling height of 2.6 meters, and a floor area of 50 m²:

• Room volume = 2.6 × 50 = 130 m³.
• Air exchange rate for an office = 4–8 (use 5 for this example).
  • Required airflow = 130 × 5 = 650 m³/hour.
• Additional airflow for employees: 5 people × 29 m³ = 145 m³/hour.
• Total airflow = 650 + 145 = 795 m³/hour.

After determining the required airflow, the fan type (axial, radial, roof-mounted, smoke exhaust, etc.) and the installation location (ceiling, wall, duct, etc.) should be decided. Additionally, the power supply type (single-phase or three-phase) should be determined. For example, in offices, fans are typically wall-mounted or window-mounted and powered by single-phase electricity. In industrial settings, fans are usually powered by three-phase electricity (380V).