Small Axial Fan Impeller (300-600mm) — UTEK-DELE Axial Fan Range
The small impeller class is the hardest working part of the range. Engine compartments have grown denser with each emission stage, while the space left for the fan has shrunk, so a 300-600 mm impeller often has to do the job that a larger fan did on previous machine generations.
Three blade families cover this class: the fixed-angle H Series for stable duty points, the PMAX high-pressure blade on its plate hub for tight engine bays, and the 4XR aluminium blade for high-temperature zones. All three share the H hub family, which keeps the shaft interface and the service procedure consistent across a machine platform.
Model Range and Specifications
Blade count, material and hub are selected together against the duty point, so a single platform can be tuned for airflow, pressure or noise without changing the mounting.
Blade Materials and Temperature Range
Blade material is selected from the working temperature and from the atmosphere around the impeller:
| Material | Composition | Temperature range | Typical duty |
|---|
| PAG | PA6 with 30% glass fibre | -40 °C to 110 °C | Heavy-load cooling, anti-aging, general engine cooling |
| PAGAS | PA6 with 15% carbon fibre and 15% glass fibre (conductive) | -30 °C to 100 °C | Dust and gas atmospheres where static discharge must be avoided |
| ALU | Die-cast aluminium ADC12 | -40 °C to 150 °C, short-term 300 °C for 2 h | High-temperature and fire-resistance zones |
The conductive PAGAS option is supplied for equipment working in explosive-risk atmospheres such as dust or gas. It addresses the working environment of the blade; machine-level certification remains the responsibility of the equipment builder.
Hub Options
Blades are supplied with matched hub sets. The hub carries the blade loads and sets the shaft interface, so it is selected together with the blade count:
| Hub type | Weight | Hub diameter |
|---|
| HUB H-6 | 0.27 kg / set | 96 mm |
| HUB H-8 | 0.41 kg / set | 133 mm |
| HUB H-10 | 0.57 kg / set | 172 mm |
| HUB H-12 | 0.805 kg / set | 206 mm |
Typical Applications
This series is normally specified for the following duties:
Engine radiator cooling on tractors and construction machinery
Cooling in narrow engine bays with limited shroud clearance
Agricultural machinery working in dust and high ambient temperature
High-temperature zones where aluminium blades are required
Specification Support
When a fan is being specified or replaced, the following points are confirmed before a blade set is released. They are the same checks used for OEM programs and for retrofit projects.
Duty point: airflow and static pressure required at the working speed, taken from the cooling pack or ventilation requirement
Installation: available diameter, shroud clearance, mounting pattern and the shaft interface of the existing hub
Environment: maximum air temperature, dust or gas atmosphere, and whether static discharge has to be avoided
Drive: available power, belt or direct drive, and whether the fan has to reverse in service
Service: blade weight for handling during maintenance and spare-part availability across the machine fleet
Blade count, profile and material are then matched to those conditions in a fixed order: material first, then blade count, then hub family, with diameter confirmed against the shroud. Working in that sequence keeps the mechanical interface stable when the duty requirement changes later in the project, and it is why the same blade family can often stay in production while the cooling pack is revised.
Quality Assurance and Dynamic Balancing
Small impellers are moulded to a controlled geometry and balanced on a hand laser balancing machine before shipment, with the blade material batch recorded against the model so a replacement set matches the original.
Customization and Series Overview
Blade count, blade profile, hub family and material can be customized for OEM programs, and existing fans can be reviewed when airflow, noise or durability has to be improved on a running machine. Where the cooling pack sits close to exhaust or turbo components, the aluminium 4XR blade is normally specified instead of a moulded blade.
Related ranges: PMAX3 fan blade | P3H fan blade | S1H sickle blade fan.