1PCS For DUNLI YWF.A4S-300S-5DIIA00 220V 0.42A 80W Axial Flow Fan F8 #dr

DUNLI · Axial Flow Fan · YWF.A4S Series · 300mm · 220V 80W · In stock

What Is the DUNLI YWF.A4S-300S-5DIIA00 Axial Flow Fan?

The DUNLI YWF.A4S-300S-5DIIA00 is a 300mm-diameter AC axial flow fan rated at 220V, 0.42A, and 80W — a substantial industrial ventilation fan, not a small electronics cooling fan. This is the type of fan you find mounted in electrical enclosure doors, HVAC ductwork, machinery ventilation panels, or condenser unit housings where high airflow volume at modest static pressure is needed. The 300mm (roughly 12-inch) diameter moves a large volume of air per revolution at relatively low RPM and noise compared to a smaller fan trying to achieve the same CFM.

In short: A 12-inch, 80-watt, mains-powered industrial exhaust fan — the kind that ventilates a control cabinet the size of a refrigerator or moves air through a machinery cooling duct, running directly on 220V single-phase AC.

Considerations When Replacing a Large Industrial Fan

1. Verify Voltage: 220V Single-Phase, Not 380V Three-Phase

This fan is designed for single-phase 220V AC — the standard mains voltage in many Asian and European industrial settings. It has two power leads (line and neutral), not three phases. Do not connect this fan to a 380V three-phase circuit — it will burn out instantly. If your facility has 380V three-phase power, a single-phase 220V tap can typically be derived from one phase and neutral. Have a qualified electrician confirm the available voltage at the fan's mounting location before ordering.

2. Mounting Hole Pattern: Measure Before Assuming

The fan frame is approximately 300mm square, but the exact outer dimensions and mounting hole spacing can vary by a few millimeters between manufacturers. If this DUNLI fan is replacing a different brand, measure the existing mounting hole pattern (center-to-center distance on all four corners) and the cutout diameter in the panel. A mismatch of even 5mm can mean drilling new holes or fabricating an adapter plate. The product photos should show the mounting dimensions — compare them against your existing fan's hole pattern before uninstalling the old unit.

3. Airflow Direction and Impedance

An arrow on the fan frame indicates airflow direction. Decide whether this fan will be intake (pushing cool outside air in) or exhaust (pulling hot inside air out). Exhaust is more common for enclosure cooling because it creates negative pressure and pulls heat directly away from the sources. However, if the fan must push or pull air through a filter — common in dusty factory environments — the filter's flow resistance reduces effective airflow. A 300mm fan pushing through a dense filter may deliver only 40-60% of its free-air CFM. Size the fan accordingly or clean/replace the filter when you install the new fan.

Key Specifications

Frequently Asked Questions

How do I wire this fan safely — does it need a contactor or can a switch handle it?

At 80W (~0.4A at 220V), the running current is modest — a standard 10A light switch or a relay with contacts rated for at least 1A at 250VAC is adequate. However, the starting inrush current of an AC fan motor can be 3-5 times the running current for the first few AC cycles. For longevity, use a switch or relay rated for inductive loads (marked with an inductive or motor HP rating). If the fan is controlled by a thermostat or PLC output, use an interposing relay — do not switch the fan directly from a PLC transistor output. Always include a fuse or circuit breaker rated appropriately (1A slow-blow is a reasonable starting point) in the fan circuit.

Can I use a speed controller or dimmer to reduce the fan speed and noise?

Standard AC axial fans with shaded-pole or capacitor-run motors are generally not designed for variable-speed operation via phase-cut dimmers. Reducing the voltage with a triac dimmer causes the motor to run inefficiently, overheat, and may cause buzzing or stalling. If you need variable speed, replace the fan with an EC (electronically commutated) fan that has built-in speed control, or use a variable-frequency drive on a three-phase fan. For simple two-speed operation, some fans have tapped windings — check the wiring diagram on the fan label.

The old fan seized and burned out — what should I check before installing the replacement?

A fan seizure is rarely spontaneous. Check for: (1) debris that entered through a missing or damaged finger guard; (2) bearing failure from lack of lubrication after years of continuous operation; (3) the fan was mounted with the shaft horizontal when it was rated for vertical mounting only (some sleeve bearings cannot handle horizontal orientation). Also check the enclosure interior for the root cause — if the fan seized because it was ingesting oily mist or dust, install a filter on the intake side of the new fan. Clean the mounting area thoroughly before bolting the new fan in place.

koeed.com — Your Trusted PLC Supplier. Industrial ventilation, cooling fans, and automation components. Worldwide shipping. Quote within 24h at Moritta@KOEED.COM.