Adjustable-Angle Fan Blades — UTEK-DELE Axial Fan Range
Adjustable-angle blades carry a separate blade root that is clamped to the hub, so the pitch can be set when the fan is built and changed later if the duty point moves. That flexibility is what allows one hub family to serve several machine platforms: the same impeller can be trimmed for airflow in one application and for static pressure in another.
The adjustable range at UTEK-DELE runs from the 180-745 mm class up to 2200 mm. Medium duties use the Z hub family with the P, S, K and 7Z series, while large industrial units use the W hub family from 560 mm to 2200 mm. Blade material is selected from the working temperature and atmosphere, with PAG as the standard heavy-load option, PAGAS for conductive duties and ALU for high-temperature zones.
Model Range and Specifications
| Model | Blade type | Blade count | Diameter range | Blade materials | Hub family | Product page |
|---|
| 1W | Adjustable | 6-12 | 560-2200 mm | PAG / PAGAS / ALU | W-3 / W-4 | 1W large axial fan |
| 5W | Adjustable | 6-12 | 560-2200 mm | PAG / PAGAS / ALU | W-3 | 5W large axial fan |
| 6W | Adjustable | 6-12 | 560-2200 mm | PAG / PAGAS / ALU | W-3 / W-6 | 6W large axial fan |
| 9W | Adjustable | 6-12 | 560-2200 mm | PAG / PAGAS / ALU | W-3 / W-10 | 9W large axial fan |
| 11W | Adjustable | 6-12 | 560-2200 mm | PAG / PAGAS | W-3 | Quoted on request |
| 10G / 2W / 8W / P8Y / S45YR | Adjustable | Quoted per project | Quoted per project | PAG / PAGAS | W family | Quoted on request |
| 9W2 | Adjustable | 6-12 | 560-2200 mm | PAG / PAGAS | W-10 | Quoted on request |
| U10W | Adjustable | 6 / 7 / 8 / 10 | 1000-2200 mm | PAG / PAGAS | W-3 | U10W large axial fan |
| 1Z | Adjustable | 5-16 | 378-725 mm | PAG / PAGAS | Z-3 | 1Z axial fan |
| 2Z / 2ZR | Adjustable | 3-16 | 378-725 mm | PAG / PAGAS | Z-3 | Quoted on request |
| 4XR | Adjustable (angle disc) | 5-12 | 180-700 mm | ALU (ADC12) | H-6 with angle disc | 4XR Series fan |
| 7XL | Adjustable | 3-16 | 250-1040 mm | PAG / ALU | Z-3 | 7XL axial fan |
| 7Z | Adjustable | 5-16 | 560-922 mm | PAG / PAGAS / ALU | Z-3 / Z-5 / Z-7 | 7Z axial fan |
| S38Z | Adjustable | 3-16 | 500-943 mm | PAG / PAGAS | Z-3 | S38Z axial fan |
| S4Z | Adjustable | 5-16 | 530-922 mm | PAG / PAGAS | Z-3 | S4Z axial fan |
| S48Z | Adjustable | Quoted per project | Quoted per project | PAG / PAGAS | Z-3 | Quoted on request |
| K6Z / K7Z | Adjustable | 3-16 | 180-1254 mm | PAG / PAGAS | Z-3 | K6Z / K7Z axial fan |
| P3Z | Adjustable | 3-16 | 250-1300 mm | PAG / PAGAS / ALU | Z-3 | P Series axial fan |
| P4Z / P5Z / P6Z | Adjustable | 1-16 | 250-1343 mm | PAG / PAGAS / ALU | Z-3 to Z-18 | Quoted on request |
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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 W-3 | 2 kg / set | 200 mm |
| HUB W-7 | 4.76 kg / set | 328 mm |
| HUB W-8 | 6.38 kg / set | 390 mm |
| HUB W-10 | 8.76 kg / set | 480 mm |
Typical Applications
This series is normally specified for the following duties:
High performance moving-air units
Livestock ventilation and cooling towers
Off-highway engine cooling and low-speed generator set dissipation
HVAC, compressors and engine-driven equipment
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
Blades and hubs are supplied as a matched set and balanced on a hand laser balancing machine before shipment, with the pitch setting recorded for the duty point. The adjustable blade-angle concept is covered by a granted Chinese utility model patent (CN 212250568 U) held by the company's manufacturing entity.
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 no pitch change is expected over the life of the machine, a fixed-angle blade gives the same airflow with fewer parts and a simpler service procedure.
Related ranges: W Series large industrial fans | P Series adjustable fans | S Series blades.
Adjustable-Angle Fan Blades — Products in This Family
The blade models below are produced in this blade family. Each product page covers the specifications, materials and replacement details; blade sets are quoted with the hub so the shaft interface is confirmed at the same time.
| Model | Product page | Diameter | Blade count | Hub |
|---|
| K6Z | K6Z Adjustable Pitch Axial Fan Blade | 180-1254 mm | 3-16 blades | Z-3 |
| P3Z | P3Z Adjustable Pitch Axial Fan Blade | 250-1300 mm | 3-16 blades | Z-3 |
| 7Z | 7Z Adjustable Pitch Axial Fan Blade | 250-1040 mm | 3-16 blades | Z-3 / Z-5 / Z-7 |
| 9W | 9W Adjustable Pitch Axial Fan Blade | 560-2200 mm | 6-12 blades | W-3 … W-10 |
| 1W | 1W Adjustable Pitch Axial Fan Blade | 560-2200 mm | 6-12 blades | W-3 … W-10 |
| 5W | 5W Adjustable Pitch Axial Fan Blade | 560-2200 mm | 6-12 blades | W-3 … W-10 |
| 6W | 6W Adjustable Pitch Axial Fan Blade | 560-2200 mm | 6-12 blades | W-3 … W-10 |
| 7XL | 7XL Adjustable Pitch Axial Fan Blade | 250-1040 mm | 3-16 blades | Z-3 / Z-5 / Z-7 |
| S4Z | S4Z Adjustable Pitch Axial Fan Blade | 530-922 mm | 5-16 blades | Z-3 |
| S38Z | S38Z Adjustable Pitch Axial Fan Blade | 500-943 mm | 3-16 blades | Z-3 |
| U10W | U10W Adjustable Pitch Large Axial Fan Blade | 1000-2200 mm | 6-10 blades | W-3 |
| 11W | 11W Adjustable Pitch Axial Fan Blade | 560-2200 mm | 6-12 blades | W-3 … W-10 |
| 4XR | 4XR Adjustable Pitch Aluminium Axial Fan Blade | 180-700 mm | 5-12 blades | H-6 |