I. Definition of SWF Mixed Flow Fan ProductsI. Definition of SWF Mixed-flow Fan Products
The full name of SWF mixed-flow fan is Meridian Acceleration Low-Noise Mixed-flow Ventilator, also known as HL3-2A. Its aerodynamic characteristics lie between axial flow fans and centrifugal fans: the airflow exits at an angle, and it possesses the dual advantages of high air volume of axial flow and high pressure of centrifugal. It is the mainstream equipment for duct ventilation.
II. Core Components of SWF Mixed-flow Fan
Casing: cylindrical straight tube type, with standard circular flanges at both ends, which can be directly connected to the duct; made of Q235 steel plate by integral spinning, with anti-corrosion spraying.
Inlet collector: streamlined trumpet shape, reducing intake vortex and noise.
Mixed-flow impeller: conical hub + twisted wing-shaped blades, welded together; factory dynamic balance check (G5.6 grade), running smoothly and with little vibration.
Post deflector blades: rectifying and stabilizing, enhancing the efficiency of the fan.
Direct coupling motor: built-in coaxial drive, no belt wear, maintenance-free; single-speed / double-speed motor, 380V three-phase.
Base hanger: suitable for floor-mounted installation, ceiling-mounted installation, and vertical installation.
III. Three major models of SWF mixed-flow fan classification
SWF-I (Single-speed General Model)
Positioning: replacing high-pressure axial flow fans, for regular duct supply and exhaust, and pressurization
Model number: 2.5# to 13# (impeller diameter 250 to 1300mm)
Air volume: 460 to 80000 m³/h, total pressure 50 to 1200 Pa
SWF-II (Two-speed Variable Speed Model)
Positioning: one machine for two uses, usually low-speed exhaust during normal times, high-speed pressurization during fire or peak hours, energy-saving and noise reduction
Model number: 6.5# to 14#
Two speed levels, wind volume and pressure can be switched, commonly used for ventilation and smoke exhaust in garages, shopping malls, and other places
SWF-III (Medium-pressure Reinforced Model)
Positioning: replacing low-pressure centrifugal fans, for long-distance ducts and high-resistance ventilation systems
Higher pressure, suitable for long ducts and multi-story ducts for pressurization
IV. Core Advantages of SWF Mixed-flow Fan
Balanced performance: higher air volume than centrifugal fans of the same volume; higher flow than ordinary axial flow fans under the same pressure; wide efficient operating range, less prone to instability under different working conditions.
Compact size: 40% smaller than centrifugal fans of the same parameters, highly adaptable for small spaces such as machine rooms and ceilings.
Low noise and energy-saving: aerodynamic optimization, noise ≤ 75 dB (A) under normal conditions; overall efficiency over 80%, more energy-efficient than old-style fans.
Flexible installation: straight pipe connection for inlet and outlet, suitable for horizontal, vertical, and ceiling installation, direct connection to the duct, no need for turning bends.
Simple maintenance: direct drive of the motor without transmission components, no need for belt replacement or lubrication procedures.
Complete derivative versions: explosion-proof SWF-B, anti-corrosion fiberglass SWF-F, fire smoke exhaust type, roof-mounted available.
V. Technical Parameter Range of SWF Mixed-flow Fan
Impeller diameter: Φ250 to 1400mm
Air volume: 440 to 130000 m³/h
Total pressure: 45 to 2200 Pa
Motor power: 0.18kW to 30kW
Speed: 960/1450/2900 r/min
Applicable medium: ordinary air ≤ 80℃; fire smoke exhaust model can withstand 280℃
The full name of SWF mixed flow fan is Meridian Acceleration Low-Noise Mixed Flow Ventilator, also known as HL3-2A. Its aerodynamic characteristics lie between axial flow fans and centrifugal fans: the airflow exits at an angle, and it possesses the dual advantages of high air volume of axial flow and high pressure of centrifugal. It is the mainstream equipment for duct ventilation.
II. Core Components of SWF Mixed Flow Fan
Casing: cylindrical straight tube type, with standard circular flanges at both ends, which can be directly connected to the duct; made of Q235 steel plate by integral spinning, with anti-corrosion spraying.
Inlet Collector: streamlined trumpet shape, reducing intake vortex and noise.
Mixed Flow Impeller: conical hub + twisted wing-shaped blades, welded together; factory dynamic balance check (G5.6 grade), running smoothly and with little vibration.
Post Guide Vanes: rectifying and stabilizing pressure, enhancing fan efficiency.
Direct Coupled Motor: built-in coaxial drive, no belt wear, maintenance-free; single-speed / double-speed motor, 380V three-phase.
Base Holes: support floor-mounted installation, ceiling-mounted installation, vertical installation.
III. Three Major Models of SWF Mixed Flow Fan Classification
SWF-I (Single-speed General Model)
Positioning: replace high-pressure axial flow fans, for regular duct supply and exhaust, and pressurization
Model Number: 2.5# to 13# (impeller diameter 250 to 1300mm)
Air Volume: 460 to 80000 m³/h, Total Pressure: 50 to 1200 Pa
SWF-II (Two-speed Variable Speed Model)
Positioning: dual-purpose machine, usually low-speed exhaust during normal times, high-speed pressurization during fire or peak hours, energy-saving and noise reduction
Model Number: 6.5# to 14#
Two-speed settings, adjustable air volume and pressure, commonly used for ventilation and smoke exhaust in garages, shopping malls, and other places
SWF-III (Medium-pressure Reinforced Model)
Positioning: replace low-pressure centrifugal fans, for long-distance ducts and high-resistance ventilation systems
Higher pressure, suitable for long ducts, multi-layer ducts for pressurization
IV. Core Advantages of SWF Mixed Flow Fan
Balanced Performance: higher air volume than centrifugal fans of the same volume; higher flow than ordinary axial flow fans under the same pressure; wide operating efficiency range, less prone to instability under different working conditions.
Compact Size: 40% smaller than centrifugal fans of the same parameters; highly adaptable for spaces in machine rooms / ceilings with limited space.
Low Noise and Energy Saving: aerodynamic optimization, noise ≤ 75dB (A) under normal conditions; overall efficiency over 80%, more energy-efficient than old-style fans.
Flexible Installation: coaxial straight pipeline for air intake and exhaust, universal for horizontal / vertical / ceiling installation, direct connection to the duct, no need for turning bends.
Simple Maintenance: direct drive of the motor without transmission components, no need for belt replacement or lubrication procedures.
Complete derivative versions available: explosion-proof SWF-B, anti-corrosion fiberglass SWF-F, fire smoke exhaust type, roof-mounted option.
V. Technical Parameter Range of SWF Mixed Flow Fan
Impeller Diameter: Φ250 to 1400mm
Air Volume: 440 to 130000 m³/h
Total Pressure: 45 to 2200 Pa
Motor Power: 0.18kW to 30kW
Speed: 960/1450/2900 r/min
Applicable Medium: ordinary air ≤ 80℃; fire smoke exhaust model with high temperature resistance 280℃
VI. Applicable Scenarios of SWF Mixed Flow Fan
Civil Buildings: ventilation and smoke exhaust in underground garages, shopping malls, hotels, stadiums, fresh air supply and exhaust in stairwells
HVAC Ducts: pressure increase for central air conditioning ducts, long-distance duct pressure increase
Industrial Plants: ventilation and dust removal in workshops, explosion-proof ventilation in chemical workshops
Municipal Tunnels: ventilation and air exchange in pedestrian tunnels, pipe galleries
VII. Installation and Selection Key Points of SWF Mixed Flow Fan
Leave a straight pipe section of 1 times the fan diameter before and after the duct to avoid vortex loss of pressure;
For high vibration conditions, use shock-absorbing pads / shock suspension brackets;
For long ducts, multiple bends, filters, etc., high-resistance air ducts, prefer SWF-III medium-pressure model;
Daily ventilation + fire smoke exhaust dual function, choose SWF-II dual-speed fire-resistant type;
For flammable and explosive workshops, select explosion-proof SWF-B (explosion-proof motor).
VIII. Model Naming Examples
SWF-II-6.5
SWF: Mixed-flow fan
II: Dual-speed type
6.5: Machine number 6.5#, impeller diameter 650mm
