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The WBLF-1251-BS3400 is a 24V brushless axial fan (12-inch / 305 mm) specifically engineered as a direct replacement for SPAL338 / SPAL BBL338. It offers IP68 protection, PWM speed control, fast ramp-up (8 seconds), and a durable design rated for ≥ 25,000 hours of operating life. Ideal for trucks, buses, refrigeration, construction machinery, and other demanding cooling applications.
WBLF-1251-BS3400 replace SPAL338
Sunlight
| Voltage: | |
|---|---|
| Quantity: | |
| Specification | Value |
|---|---|
| Motor wiring | Black wire = Positive, Brown wire = Negative; Clockwise rotation |
| Axial clearance | ≤ 0.25 mm |
| Pressure test | 660 VAC, 1s, ≤ 5 mA leakage |
| Protection grade | IP68 |
| Insulation class | H |
| Insulation resistance | ≥ 20 MΩ (500 VDC) |
| Operating temperature | –40 °C ~ +85 °C |
| Humidity tolerance | 0–100% |
| Operating life | ≥ 25,000 hours |
| Vibration resistance | 20 ms, 5 G |
| Rated voltage | 24 VDC |
| Voltage range | 16–32 VDC |
| Fuse rating (controller) | 30 A |
| Lead length | 500 ±20 mm, with Ø8 mm PVC tube length 450 mm |
| Power line model | UL1015, 12 AWG |
| Weight | Approx. 3 kg |
| Max Fan Speed | 3400rpm |
| Min Fan Speed | 2000rpm |
| Weight | 2.2KG |
| Operating supply voltage rang | 16V -32V |
| Operating working temperature range | -40°C - 85°C |
| Storage temperature range |  -40°C - 120°C |
| Life time | up to 40000 hours depending on missing profile |
| Time from 0 rpm to max speed | 8 seconds |
| IP grade | IP68 |
The yellow line is Current & The blue line is Airflow
This 24V 12-inch brushless axial fan is widely used in:
Commercial vehicles (buses, trucks, trailers)
Construction machinery (excavators, loaders, bulldozers)
Agricultural equipment (tractors, harvesters)
Refrigeration & HVAC systems (bus A/C, truck refrigeration units)
Industrial cooling solutions requiring reliable, waterproof fans
IATF I16949:2016 Certificate
IATF 16949:2016 Certificate
EMC Certificate 
CE certificate
Q1: What is the current draw at full load?
A1: At 24V under rated load, expect ~25–30 A depending on backpressure and system resistance.
Q2: Does the fan support speed control?
A2: Yes — supports PWM input for variable speed control.
Q3: What is the expected service life?
A3: Designed for ≥ 25,000 hours, depending on duty profile and ambient conditions.
Q4: Is the fan waterproof and dustproof?
A4: Yes — rated IP68, sealed against dust ingress and water immersion.
Q5: What environmental limits does it support?
A5: Operating: –40 °C to +85 °C; storage to +120 °C; humidity 0–100%.
Q6: What protections are built in?
A6: Includes reverse polarity protection, 30A fuse, robust insulation, pressure testing, and vibration tolerance.
| Specification | Value |
|---|---|
| Motor wiring | Black wire = Positive, Brown wire = Negative; Clockwise rotation |
| Axial clearance | ≤ 0.25 mm |
| Pressure test | 660 VAC, 1s, ≤ 5 mA leakage |
| Protection grade | IP68 |
| Insulation class | H |
| Insulation resistance | ≥ 20 MΩ (500 VDC) |
| Operating temperature | –40 °C ~ +85 °C |
| Humidity tolerance | 0–100% |
| Operating life | ≥ 25,000 hours |
| Vibration resistance | 20 ms, 5 G |
| Rated voltage | 24 VDC |
| Voltage range | 16–32 VDC |
| Fuse rating (controller) | 30 A |
| Lead length | 500 ±20 mm, with Ø8 mm PVC tube length 450 mm |
| Power line model | UL1015, 12 AWG |
| Weight | Approx. 3 kg |
| Max Fan Speed | 3400rpm |
| Min Fan Speed | 2000rpm |
| Weight | 2.2KG |
| Operating supply voltage rang | 16V -32V |
| Operating working temperature range | -40°C - 85°C |
| Storage temperature range | -40°C - 120°C |
| Life time | up to 40000 hours depending on missing profile |
| Time from 0 rpm to max speed | 8 seconds |
| IP grade | IP68 |
The yellow line is Current & The blue line is Airflow
This 24V 12-inch brushless axial fan is widely used in:
Commercial vehicles (buses, trucks, trailers)
Construction machinery (excavators, loaders, bulldozers)
Agricultural equipment (tractors, harvesters)
Refrigeration & HVAC systems (bus A/C, truck refrigeration units)
Industrial cooling solutions requiring reliable, waterproof fans
IATF I16949:2016 Certificate
IATF 16949:2016 Certificate
EMC Certificate CE certificate
Q1: What is the current draw at full load?
A1: At 24V under rated load, expect ~25–30 A depending on backpressure and system resistance.
Q2: Does the fan support speed control?
A2: Yes — supports PWM input for variable speed control.
Q3: What is the expected service life?
A3: Designed for ≥ 25,000 hours, depending on duty profile and ambient conditions.
Q4: Is the fan waterproof and dustproof?
A4: Yes — rated IP68, sealed against dust ingress and water immersion.
Q5: What environmental limits does it support?
A5: Operating: –40 °C to +85 °C; storage to +120 °C; humidity 0–100%.
Q6: What protections are built in?
A6: Includes reverse polarity protection, 30A fuse, robust insulation, pressure testing, and vibration tolerance.
