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Cleanroom HVAC and Air Handling Equipment
Mixed-Flow Inline Fan
A compact tubular fan that combines axial entry with centrifugal pressure development, then straightens the discharge flow for efficient installation in straight duct runs.
- Compact Mixed-Flow Impeller
- External Motor Arrangement
- Integrated Flow Straighteners
- Straight-Through Duct Layout
Product Introduction
The mixed-flow inline fan places a conical mixed-flow impeller and stationary guide vanes inside a rigid circular housing. Air enters along the fan axis, gains both axial velocity and radial pressure through the impeller, and passes through straightening vanes before leaving the discharge flange. Positioning the motor and drive components outside the primary airstream improves access and protects them from hot or contaminated exhaust while retaining the space-saving advantages of an inline unit.
Key Features
Downstream guide vanes recover swirl energy and deliver a more uniform velocity profile to the connected duct.
An external motor base keeps electrical and drive components away from the primary airstream and within easy service reach.
Rolled flanges and a welded tubular frame allow horizontal or vertical mounting between standard circular duct sections.
Customer Product Concerns
Space-limited duct systems often need more pressure than an axial fan can provide but cannot accommodate the turning space of a conventional centrifugal scroll.
A large scroll fan cannot fit into a straight mechanical-room duct route.The tubular mixed-flow design installs directly in line with the duct while developing useful centrifugal pressure.
Swirling discharge from a compact fan produces noise and uneven readings at downstream sensors.Fixed straightening vanes reduce rotational velocity and improve the airflow profile leaving the fan.
A motor located inside warm or contaminated exhaust air is difficult to inspect and cool.The external motor arrangement separates the drive from the primary air path and provides direct plant-side access.
Rigidly connected inline fans transmit vibration along long metal duct runs.Flexible connectors and external spring isolators decouple the flanged fan casing from adjacent duct sections.
Typical Applications
Cleanroom make-up and supply-air duct boostersPharmaceutical production-area general exhaustLaboratory return-air and transfer systemsHeat-removal exhaust from equipment roomsLong circular ducts with moderate-to-high resistance
Technical Parameters
Typical fabricated dimensions for an external-motor mixed-flow inline fan serving commercial or cleanroom ductwork are shown below.
| Core Material | Coated-steel mixed-flow impeller and straightening vanes inside a rolled carbon-steel tubular housing |
|---|---|
| Panel Thickness | 2.5-5.0 mm cylindrical casing and formed end-flange thickness |
| Effective Width | 450-1800 mm nominal circular duct diameter |
| Maximum Length | Up to 3200 mm overall fan length including external motor and drive frame |
| Steel Facing Thickness | 2.0-5.0 mm coated steel for the shell, vane supports and access covers |
| Core Density | Approximately 7800-7900 kg/m³ for the fabricated steel airflow components |
| Thermal Conductivity | Approximately 45-55 W/(m·K) for the carbon-steel casing and vane assembly |
| Surface Finish | Dark teal industrial powder coating with galvanized flanges and protected fasteners |
| Joint Type | Welded tubular casing with bolted circular flanges, external bearing supports and a guarded belt-drive connection |
| Customization | Available based on the intended application and operating environment. |
Available Options
Direct-drive or external belt-drive configurationHorizontal, vertical-up or vertical-down mounting frameAcoustic silencer and flexible connector packageSpark-resistant wheel and high-temperature bearing arrangement
Planning a Mixed-Flow Inline Fan specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
