The one part that wears. And the one that matters.

The radial-vane geometry is what turns motor rotation into regenerated pressure. A rotatable 3D model of the YEBL-IMP is on the way; until then, the render shows the cast fin form, the hub and the bored, keyed centre that fixes it to the shaft.

Ordering a spare is the highest-value maintenance you can do on a side-channel blower — the rotor costs a fraction of a new machine and restores it to rated output.

An impeller is not a generic disc. Five measured figures determine whether it fits the shaft, seats in the channel and delivers the rated pressure. Get any one wrong and the blower either will not assemble or will not perform.

• OD — outside diameter — Sets how the impeller seats in the side channel. Too large will not turn; too small loses the regeneration that builds pressure. Ranges 215–470 mm across the seven sizes.
• Ø bore — inside diameter — The shaft fit. Must match the motor shaft it mounts on, 19–60 mm. This, with the keyway, transmits torque without slip.
• Thickness (t) — Axial width of the vane disc, 29–66 mm. Sets the fit between channel faces and the volume each vane pocket carries.
• Keyway — Key size, 5–12 mm, that locks the impeller to the shaft. Must match the shaft key exactly for concentric, slip-free drive.
• Fin count (Z) — Number of radial vanes, 52–58. Sets how many regeneration events occur per revolution — the fin count is a performance parameter, not cosmetic.
• Balance — Not a caught dimension but decisive: every YEBL-IMP is dynamically balanced so it runs true at speed. An unbalanced disc vibrates and kills bearings.

Replacing an impeller is straightforward but exacting. Isolate and lock out the motor, open the blower cover, and note the impeller orientation and any shims before removal. Draw the old rotor off the shaft, clean the shaft and keyway, and inspect the side channel: if it is smooth, a new impeller restores rated performance; if it is scored, the housing needs attention too. Fit the new YEBL-IMP with the correct key, set the running clearance to the manufacturer’s figure, and confirm the disc turns freely by hand before power-on.

Then protect your work. The single reason impellers wear is ingested particles across that fine clearance, so the new rotor is only as durable as the inlet filterin front of it. Keep the filter clean, guard vacuum lines against liquid carry-over, and log the blower’s baseline current — a rising amp draw is the earliest sign the clearance is closing up again.

Replacement checklist

• Isolate and lock out the motor before opening the cover.
• Record orientation, shims and clearance of the old rotor.
• Inspect the side channel; renew the housing only if scored.
• Fit the matched YEBL-IMP with the correct key; set clearance.
• Turn by hand, confirm rotation, log baseline amps on start.

These rotors are the wearing part inside our side-channel blower families. Identify the blower, count the stages, then match the five dimensions. A single stage uses one impeller; a double or triple stage uses two or three on one shaft, sometimes stepped between sizes.

• Single Stage · YEBL-1 — One impeller per unit. Match OD, bore, thickness, key and fin count to the worn rotor.
• Double Stage · YEBL-DS — Two impellers on one shaft. Confirm whether both stages share a size or step between two.
• High Pressure · YEBL-HP — Two or three staged impellers. Identify the stage position before ordering the replacement.

Not sure which stage or size? Send the blower model number plus the five measured dimensions of the old rotor and we will confirm the correct YEBL-IMP before you commit to the order.