The Industrial Mixed Flow Ventilation Fan bridges the performance gap between axial and centrifugal fans. Engineered for inline duct configurations, the impeller combines axial-flow blade angles with centrifugal-flow radial components. This geometry accelerates air radially and axially, generating higher static pressure than standard axial fans while maintaining a straight-through airflow path that simplifies duct layout. Deployed in commercial HVAC mains, industrial exhaust loops, and process ventilation, the unit operates reliably under continuous heavy loads.

Key Features

High Pressure-to-Flow Ratio: Operates efficiently against high system resistance, maintaining rated airflow through complex, long-run duct networks.

Inline Space-Saving Footprint: Axial inlet and outlet alignment allows direct mounting within circular ductwork, eliminating the 90-degree turns required by traditional centrifugal blowers.

Acoustically Optimized Housing: Internal flow guide vanes and sound-absorbent lining minimize turbulence generation and suppress casing breakout noise.

Dual-Voltage & EC Motor Compatibility: Supports standard single-phase/three-phase AC inputs or high-efficiency Electronic Commutated (EC) motors with 0-10V / PWM speed control.

Removable Impeller Assembly: Motor and impeller cartridge can be extracted from the rigid housing without dismantling connected ductwork, reducing maintenance downtime.

Technical Specifications

Parameter	Standard Metric Specs	Imperial Equivalents
Airflow Capacity Range	350 - 12,000 m3/h	205 - 7,060 CFM
Max. Static Pressure	Up to 1,250 Pa	Up to 5.0 in.wg
Impeller Diameter	200 mm - 800 mm	7.8 in. - 31.5 in.
Sound Pressure Level	38 - 72 dB(A) @ 3m	38 - 72 dB(A) @ 9.8ft
Operating Temperature	-20°C to +60°C	-4°F to +140°F
Motor Protection / Insulation	IP54 / IP55 rated, Class F insulation	NEMA 3 / 4 equivalent
Power Supply	220V-240V/1Ph/50/60Hz, 380V-480V/3Ph/50/60Hz	Same

Construction & Working Principle

Structural Build

Casing: Pressed galvanized sheet steel or heavy-gauge carbon steel, finished with electrostatically applied polyester-epoxy powder coating (minimum thickness 80 um). Stainless steel 304/316 options available for corrosive environments.

Impeller: Backward-curved blades molded from high-strength polyamide (PA66 with 30% glass fiber) for sizes up to 400 mm; precision-welded aluminum alloy balancing-graded to ISO 1940 G2.5 for sizes above 450 mm.

Motor Mounting: External rotor motor configuration or IEC standard foot/flange-mounted motor coupled via rigid bracket supports, eliminating vibration transfer to the duct wall.

Working Principle

Air enters the impeller axially where kinetic energy is imparted by the rotating blades. As the air passes through the diagonal blade matrix, centrifugal forces radially compress the airflow against the outer housing shroud. Internal stator guide vanes straighten the helical discharge vector into linear axial momentum, converting dynamic pressure head into static pressure. This mechanism enables the fan to overcome high system resistance curves while preserving compact duct dimensions.

Applications

Commercial HVAC Supply & Exhaust: Ventilation loops in office towers, educational facilities, and hospitality complexes requiring concealed ceiling plenum installation.

Industrial Process Extraction: Fume and heat removal from commercial kitchens, laser cutting enclosures, and chemical storage ventilation cabinets.

Agricultural Climate Control: High-volume air exchange in multi-tier livestock housing and precision agricultural greenhouses.

Data Center & Server Room Thermal Management: Enclosure cooling loops and auxiliary hot-aisle exhaust manifolds.

Available Options & Customization

Motor Options:

AC External Rotor Motors (two-speed or voltage-controllable via triac/transformer).

EC Brushless DC Motors with integrated MODBUS RTU communication ports.

Material Variations:

Explosion-proof configurations (ATEX / IECEx certified for Zone 1 and Zone 2 hazardous atmospheres).

Marine-grade anti-salt spray coatings.

Accessories:

Inlet/outlet flexible connection sleeves.

Backdraft gravity dampers and motorized butterfly shut-off valves.

Duct-mounted sound attenuation silencer pods (lengths 600 mm to 1,500 mm).

Manufacturing & Quality Control

Production relies on CNC fiber laser cutting lines, robotic MIG/TIG welding cells, and automated powder coating booths to maintain dimensional tolerances within +/- 0.5 mm across sheet metal assemblies.

Dynamic Balancing: Every completed impeller assembly undergoes automated multi-plane dynamic balancing on Schenck balancing rigs to reduce operational vibration below 0.8 mm/s.

Performance Testing: Air performance curves are mapped in compliance with AMCA 210-07 and ISO 5801 standards using a chamber-type airflow test rig.

Electrical & Durability Testing: 100% of manufactured units undergo dielectric strength testing (1,500V AC for 1 min), continuous full-load run-in testing, and thermal imaging inspection prior to packaging.

Compliance Certification: Units comply with CE directives (Low Voltage 2014/35/EU, EMC 2014/30/EU), ISO 9001 quality management standards, and ErP energy efficiency directives.

FAQ

Q: Can this mixed flow fan be installed vertically in a duct system?

A: Yes. The structural rigidity of the casing and the thrust-load capacity of the motor bearings permit installation in horizontal, vertical, or inclined duct orientations without performance degradation. Ensure support hangers are fixed directly to structural building elements rather than resting solely on the duct skin.

Q: How do mixed flow fans compare acoustically to traditional centrifugal blowers?

A: Mixed flow fans generally emit lower noise levels than centrifugal blowers operating at equivalent duty points because the straight-through airflow path eliminates internal turbulence caused by abrupt scroll housing turns. When sound attenuation is critical, inline acoustic silencers can be directly flanged to the intake or discharge sides.

Q: What is the lead time for standard catalog units versus custom OEM specifications?

A: Standard catalog units configured with regular AC motors ship within 10 to 15 business days. Custom requirements-such as ATEX-certified explosion-proof motors, specialized RAL color coatings, or custom flange drilling patterns-typically require 25 to 35 business days depending on order volume.

Q: What is the minimum batch size (MOQ) for custom-branded or private-label casings?

A: OEM modifications, including laser-engraved nameplates, custom housing paint codes, and tailored electrical wiring harnesses, are available starting at a minimum order quantity of 50 units per specification size.

Q: How is motor speed regulated on the EC motor variant?

A: EC motor variants accept a standard 0-10V DC analog control signal, PWM input, or direct RS485 digital commands via MODBUS RTU protocol. This allows seamless integration into Building Management Systems (BMS) for demand-controlled ventilation (DCV).

Q: What documentation is provided with commercial shipments?

A: Every shipment includes individual factory test reports (air performance, current draw, vibration level), material traceability certificates, CE declarations of conformity, and installation/maintenance manuals translated into English.

Engineering Resources & Request a Quote

To streamline your mechanical design and integration process, download our verified engineering documents below or submit your application criteria for a prompt commercial quotation:

[Download Full PDF Datasheet] (Complete Technical Specs & Dimension Drawings)
[Download STEP 3D CAD Files] (Mechanical Integration ZIP Archive)
Required Airflow (CFM or m3/h):
Static Pressure Requirement (in.wg or Pa):
Duct Diameter Constraint (mm or inches):
Power Supply Availability (V/Ph/Hz):
Estimated Annual Volume / Trial Order Quantity:

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