The **W2AP-A15-R/UL** is a high-performance industrial AC axial fan manufactured by **Sanyo Denki** under the **San Ace 120W** series. It is specifically designed for high-reliability applications where moisture, dust, and oil resistance are required (IP67 or IP55 rated depending on specific sub-certifications). --- ## 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Frame Size** | 120 x 120 x 38 mm | | **Rated Voltage** | 100 / 115 V AC (50/60Hz) | | **Input Power** | 16 W (50Hz) / 14 W (60Hz) | | **Rated Speed** | 2,700 RPM (50Hz) / 3,100 RPM (60Hz) | | **Max Airflow** | 2.5 m³/min (88.3 CFM) | | **Max Static Pressure** | 63.7 Pa (0.256 inchH2O) | | **SPL (Sound Pressure Level)** | 40 dB(A) / 44 dB(A) | | **Bearing Type** | Dual Ball Bearing | | **Life Expectancy** | 60,000 Hours @ 60°C | --- ## 2. Key Electronic & Mechanical Components ### A. The Motor Structure * **Shaded Pole or Capacitor-Run Motor:** Typical for the San Ace AC series, these motors are brushless in nature, reducing friction and EMI (Electromagnetic Interference). * **Windings:** High-grade copper coils treated with insulation varnish to prevent short-circuiting in humid environments. * **Thermal Protector:** The "UL" designation implies the motor includes an impedance protection or thermal cutoff mechanism to prevent the fan from catching fire in a locked-rotor condition. ### B. The Bearing System * **Dual Ball Bearings:** Unlike sleeve bearings, double ball bearings allow for operation in any orientation (horizontal, vertical, or angled) and offer significantly higher MTBF (Mean Time Between Failures). ### C. Housing and Material * **Frame:** Die-cast aluminum. This acts as a heat sink for the motor windings, allowing for better thermal dissipation. * **Impeller:** Flame-retardant plastics (UL 94V-0). * **Ingress Protection:** The electronics (stator and PCB) are often encapsulated in a specialized epoxy resin to protect against water and dust (common in the W-series "Waterproof" fans). --- ## 3. Wiring and Connection The device typically features lead wires or terminals. For the **-R/UL** suffix, it generally utilizes: 1. **Black/Grey Wires:** Power input (Polarity does not matter for AC, but grounding the frame is recommended). 2. **Grounding:** A screw hole is usually provided on the aluminum frame for earthing. --- ## 4. Performance Graph Summary | Frequency | Speed (RPM) | Airflow (CFM) | Static Pressure | | :--- | :--- | :--- | :--- | | **50 Hz** | 2,700 | 74.1 | Lower | | **60 Hz** | 3,100 | 88.3 | Higher |