XinFeng Classroom | Ventilator Series: Fan Application Environments and Selection

01  

Fundamentals of Fan Selection  

1. Fan manufacturing can utilize different materials based on specific operating environments: carbon steel fans, aluminum alloy fans, stainless steel fans, etc.

     2. Fan selection can be based on operational requirements: standard fans, kitchen-specific fans (easy-clean, oil-resistant), explosion-proof fans, corrosion-resistant fans, explosion-proof and corrosion-resistant fans, etc. 

    3. Fan selection can be based on environmental requirements: high-temperature resistance, dust resistance, spark resistance, thermal insulation, soundproof enclosures, rain resistance, etc.

02 

Fan Design Selection

        1. Fan manufacturing can be categorized based on ease of transportation, on-site installation, and maintenance: outward-swinging design, segmented design, integrated bellows design, design with inlet duct and damper, independent bearing housing design, disassemblable casing design (horizontal or radial disassembly), integrated inlet cone design, variable width and diameter coefficient design, variable frequency drive design, etc.

 2. Confirmation and Selection of Fan Rotation Direction and Installation Angle: Stand facing the fan drive shaft direction as the reference. Extend your thumb toward the shaft and curl the tips of your other four fingers toward your palm. The direction they point indicates the impeller's rotation direction. For example: - If your right hand's curled fingers align with the impeller's rotation direction, it is clockwise rotation. - If your left hand aligns, it is counterclockwise rotation.

03 

Common Parameters and Technical Requirements for Fans

     6. Common Parameters and Technical Requirements for Fan Selection: General exhaust and induced draft fans: Total pressure P = … Pa, Flow rate Q = … m³/h, Altitude (local atmospheric pressure), Drive method, Conveyed medium (air may be omitted), Impeller rotation direction, Inlet/outlet angle (viewed from motor end), Operating temperature T = … °C (ambient temperature may be omitted), Motor model, etc. 

High-Temperature Fans and Other Specialized Fans: Total Pressure P = … Pa, Flow Rate Q = … m³/h, Inlet Gas Density kg/m³, Drive Method, Conveyed Medium (Air may be omitted), Impeller Rotation Direction, Inlet/Outlet Angle (Viewed from Motor End), Operating Temperature T = … °C, Instantaneous Maximum Temperature T = … °C, Inlet Gas Density □ kg/m³, Local Atmospheric Pressure (or local altitude). Commonly used fan calculation formula (simplified, approximate, generally applicable): Altitude conversion to local atmospheric pressure: (760 mmHg) - (Altitude ÷ 12.75) = Local Atmospheric Pressure (mmHg) Note: No correction needed for altitudes below 300m.

Fan flow rate requires no correction at altitudes between 0 and 1000 meters above sea level. Add 2% to the flow rate at altitudes between 1000 and 1500 meters above sea level. Add 3% to the flow rate at altitudes between 1500 and 2500 meters above sea level. Add 5% to the flow rate at altitudes above 2500 meters above sea level.