BT3-0700-4 Centrifugal Blower – 24V, 3 Speed

The BTRAC BT3-0700-4 centrifugal blower is engineered for mobile HVAC systems operating on 24-volt DC electrical platforms. It is based on the SPAL 009-B70-74D centrifugal motor fan design and provides reliable airflow for cab heat, defrost, and ventilation applications in heavy-duty equipment.

Because the blower uses a centrifugal (radial) fan design, it maintains airflow more effectively as static pressure increases. As a result, it performs well in ducted HVAC systems where airflow resistance is present. In addition, the clockwise (CW) rotation ensures proper airflow direction for systems designed around this configuration.

The BT3-0700-4 supports three-speed operation, which allows airflow to be adjusted to match comfort needs and operating conditions. Therefore, it works well in applications that require flexible airflow control without sacrificing reliability. The compact housing also allows installation in tight HVAC enclosures commonly found in trucks, buses, and off-highway machinery.

Furthermore, SPAL performance data shows stable airflow across a wide static pressure range at a 26V DC test voltage, supporting dependable operation in real-world mobile environments. Because of its proven design and interchange compatibility, the BT3-0700-4 serves as a reliable OEM-style replacement centrifugal blower.

Specifications

Electrical

• Voltage: 24V DC

• Test Voltage: 26V DC

• Speed Capability: 3-Speed (available on request per SPAL)

Blower & Configuration

• Blower Type: Centrifugal (radial)

• Rotation: Clockwise (CW)

• Motor Type: DC centrifugal motor fan

Performance (from SPAL test data @ 26V DC)

• Airflow @ 0 mm H₂O: 580 m³/h

• Airflow @ 10 mm H₂O: 520 m³/h

• Airflow @ 20 mm H₂O: 480 m³/h

• Airflow @ 30 mm H₂O: 430 m³/h

• Airflow @ 40 mm H₂O: 390 m³/h

• Airflow @ 50 mm H₂O: 340 m³/h

• Airflow @ 60 mm H₂O: 260 m³/h

• Airflow @ 70 mm H₂O: 210 m³/h

• Airflow @ 80 mm H₂O: 140 m³/h

• Airflow @ 90 mm H₂O: 80 m³/h

(Reference: 1 mm H₂O ≈ 0.04 in H₂O; 1 m³/h ≈ 0.59 CFM)

Current Draw (approx.)

• 0 mm H₂O: 11.7 A

• 30 mm H₂O: 9.0 A

• 50 mm H₂O: 7.7 A

• 70 mm H₂O: 6.2 A

• 90 mm H₂O: 4.5 A

Physical

• Approximate Weight: 1.2 kg (2.65 lb)

• Mounting Note: Use wide-head screws or washers when fastening the unit

Cross Reference Numbers

30000561

Applications & Notes

• Designed for 24-volt mobile HVAC systems

• Centrifugal design supports airflow under static pressure

• Clockwise rotation (verify before installation)

• Compact housing for tight HVAC enclosures

• Known for low noise operation

• Available by request in 2-, 3-, or 4-speed configurations

• Always verify voltage, rotation, and mounting requirements before installation