Dundar CM 21.4D Rare Blade Dust Suction Fan (Single Phase) 1250 m³ 1460 RPM

Product Type: CM 21.4D
Power Source: AC
Voltage: 220
Power: 270 W
RPM: 1460
Airflow: 1250 m³/h
Sound (dB(A)): 50 dB(A)
Weight: 13.7 kg

 

 

MODEL	C	D	E	H	L	O	P	S	T
CM 21.4D	420	265	360	360	198	220	200	150	169

Dust Extraction Fan

Dust extraction fans are essential for industries aiming to reduce pollution, maintain a clean working environment, and ensure safer working conditions for employees in production, manufacturing, or industrial facilities. Different industrial processes produce various sizes of dust particles, some settling while others remain suspended in the air. Typical dust extraction fans are systems that either filter or draw in dirty air. Depending on the type of dust produced by industrial processes, different fan equipment is used to carry out dust collection tasks. Centrifugal fans are commonly used for handling high volumes of dust in industrial processes.

Applications of Dust Extraction Fans

Dust extraction fans are used in areas where axial fans fail to provide sufficient pressure and airflow, including:

• Environments requiring dust-laden air evacuation
• Duct applications where axial fans are insufficient
• General and industrial buildings
• Carpentry workshops
• Polishing machines
• Painting booths
• Factories
• Environments with dust and vapor
• Cooling industrial machines (e.g., welding machines, transformers, compressors, etc.)

Fan Housing and Impeller

• Cold-drawn high-quality CRP steel radial casing
• Environmentally friendly, high corrosion resistance with electrostatic epoxy powder coating
• Galvanized forward-curved radial impeller tested dynamically according to ISO 1940 standards
• High-pressure and airflow values achieved through nozzle applications
• Cage-protected air intake to prevent foreign matter entry
• Robust and smooth casing design through special flange joining
• Low noise level
• Right and left mounting options for desired orientation

Motor

• High-tech CNC machine-made high-quality production
• High heat transfer aluminum motor body
• Long bearing life with balanced rotor according to ISO 1940 standards
• Insulation class F with a wide operating range (-40° to +70°)
• 230 V / 50 Hz Single-phase fan motor
• 400 V / 50 Hz Three-phase fan motor
• Certified components according to standards
• IP 54 Protection Class (optional IP 55 production available)
• Inverter control available for three-phase fans

Things to Consider in Fan Selection

When selecting a fan, four parameters should be considered:

1. Required Airflow
2. Pressure Loss
3. Acceptable Sound Level
4. Electrical Power Connection Type

For ventilation purposes, the required airflow is determined based on the environment's purpose, the number of occupants, and activities. Below is a table for different environments and the required air change factors:

Environment	Air Change Factor
Auditoriums	6-8
Paint Booths	25-50
Safe Deposit 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, Copy Rooms	10-15
Machinery Rooms	10-40
Shops	4-8
Dry Cleaning	5-15
General Workshops	4-8
Hospitals	8-12
Laboratories	8-15

Based on these factors, the required airflow can be calculated as:

$$Q [m^3/hour] = Air Change Factor (1 hour) \times Volume (m^3)$$

or

$$Q [m^3/hour] = Number of people \times required airflow per person$$

After determining the required airflow, the suitable duct design should be made considering sound and air velocity criteria, and pressure losses should be calculated. Based on the environment where the fan will operate, the fan type (axial, radial, roof, smoke extraction, etc.) should be selected according to the specified airflow-static pressure curve.

In summary, for an office setting:

If 5 people work in an office with a ceiling height of 2.6 meters and a floor area of 50 m², the total volume is:

$$2.6 \times 50 = 130 m^3$$

Assuming an air change factor of 5, the required airflow will be:

$$130 \times 5 = 650 m^3/hour$$

If considering normal activity (non-smoking), the required airflow would be:

$$5 \times 29 = 145 m^3$$

Total airflow needed would then be:

$$650 + 145 = 795 m^3/hour Fan selection should be based on this airflow requirement.$$