Overview
The frame version of the external rotor fan: a square plate with a circular opening, designed to bolt onto a wall, a panel or a duct flange. It is the variant used when the fan has to sit in a flat surface rather than on a coil ring.
The short body helps where depth is limited behind the panel. Mounting holes, frame size and impeller diameter vary across the range, so match the cut-out and the fixing centres before ordering.
Where it fits
- Wall and panel exhaust
- Equipment housings with a flat mounting face
- Duct flanges and plenum walls
- Retrofit of an existing square opening
Specifications
| Model | Blade Diameter | Dimensions | Installation Hole Distance | Drum Diameter | Shape Thickness |
|---|---|---|---|---|---|
| YWF-200 | 200 | 270 | 220 | 210 | 93 |
| YWF-250 | 250 | 320 | 270 | 260 | 102 |
| YWF-300 | 300 | 370 | 320 | 310 | 105 |
| YWF-350 | 350 | 420 | 370 | 360 | 135 |
| YWF-400 | 400 | 470 | 420 | 410 | 140 |
| YWF-500 | 500 | 570 | 520 | 510 | 160 |
| YWF-600 | 600 | 670 | 590 | 610 | 185 |
Selection and installation notes
Measure the hole centres, not just the frame size. Two frames of the same nominal size can differ in fixing pattern.
Add a shutter or guard on the exposed side. The frame does not protect the blades by itself.
FAQ
What is the difference from the drum type?
The frame type bolts to a flat surface; the drum type mounts in a ring around a coil. The airflow and motor options overlap, but the mounting does not.
Can it replace a wall fan directly?
Only if the cut-out, hole centres and depth match. Send the old label or the measurements.
Is a shutter available?
Yes, matched to the frame. It closes the opening when the fan stops and adds a small resistance.
Which way should the air flow?
Out of the enclosure for exhaust duty. Confirm the intended direction before ordering; some models are directional.
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