Ziehl Abegg Ziehl-Abegg RH
Ziehl-Abegg free-running centrifugal impellers with type code RH, GR or ER, for the ZAbluefin, Cpro/C, ZAvblue and Vpro ranges, with maximum airflows of up to 115,000 m³/h in the C range.
In the Ziehl-Abegg catalogue of centrifugal fans, free-running impellers appear with type codes beginning with RH, GR or ER, followed by two digits for the nominal size, a letter for the product range and the rest of the type code. In the catalogue examples, code 25 corresponds to a nominal size of 250 mm, 56 to 560 mm and 63 to 630 mm. The letter that follows shows the range: I for ZAbluefin, C for Cpro and the C range, D for ZAvblue2, V for ZAvblue (suffixes .AR, .BR, .VR) and for Vpro (suffix .1R).
The catalogue example "ER31C-2DN.B7.CR" is read by the same rule: the prefix ER, the size code 31 and the letter C, so the Cpro/C range. For a quotation, please send us the complete code from the nameplate or from the impeller, the voltage and frequency and, if you have it, a photo of the motor; we confirm the code and the availability in the quotation.
Models and codes
| Code | Note |
|---|---|
| RH56I-ZID.GL.CR | catalogue code example for the ZAbluefin range (letter I); size 56 corresponds to a 560 mm impeller. |
| GR25I-6ID.BD.CRP | catalogue code example, ZAbluefin, size 25 (250 mm). |
| GR63I-ZID.GQ.1R | catalogue code example, ZAbluefin, size 63 (630 mm). |
| ER31C-2DN.B7.CR | catalogue code example for the Cpro/C range (letter C), prefix ER. |
| GR50V-ZIK.GG.1R | catalogue code example for the Vpro range (letter V, suffix .1R). |
| GR25V-4IP.ZC.AR | catalogue code example for ZAvblue (letter V, suffix .AR). |
| RH45V-ZIK.GG.VR | catalogue code example for ZAvblue (letter V, suffix .VR). |
Key specifications
| Type code prefixes | RH, GR, ER |
|---|---|
| Range letter in the code | I = ZAbluefin; C = Cpro / C range; D = ZAvblue2; V = ZAvblue and Vpro |
| Nominal size | given by the two digits after the prefix (catalogue examples: 25 → 250 mm, 56 → 560 mm, 63 → 630 mm) |
| ZAbluefin: maximum airflow and pressure | up to 86,000 m³/h and 2,600 Pa; 21 sizes from 250 to 1,120 mm |
| C range: maximum airflow and pressure | up to 115,000 m³/h and 3,100 Pa; sizes from 225 to 1,120 mm |
| Vpro: maximum airflow and pressure | up to 18,000 m³/h and 1,300 Pa; sizes from 190 to 630 mm |
| Temperature of the medium handled | ZAbluefin −35 … +80 °C; C range −20 … +80 °C; Vpro −30 … +60 °C |
| Motors | external-rotor AC or EC with integrated controller, depending on range |
The Ziehl-Abegg catalogue "Product range centrifugal fans" (edition 01/2026) is current on the manufacturer's website, with no withdrawal notice for the ranges shown.
Frequently asked questions
What do RH, GR and ER at the start of the code mean?
They are the type code prefixes of the free-running centrifugal impellers in the manufacturer's catalogue. In the catalogue's table of examples, the same range appears with all three prefixes: RH__I, GR__I and ER__I for ZAbluefin, RH__C, GR__C and ER__C for Cpro/C. The prefix and the rest of the code are read from the nameplate, and we confirm the variant in the manufacturer's documentation.
How do I find the impeller diameter from the code?
The two digits after the prefix indicate the nominal size; in the catalogue examples, 25 → 250 mm, 56 → 560 mm, 63 → 630 mm. The sizes are standardised and broadly follow the outer diameter of the blades, according to the catalogue; for other codes we confirm the size in the manufacturer's documentation.
What details do I send for a quotation?
The complete code from the nameplate, the voltage and frequency, the airflow and pressure required, the temperature of the medium and, for an impeller without motor, the motor data. Made to order, the lead time is usually 1–4 weeks; we confirm the availability and the exact lead time in the quotation.
The listing explains the code structure and the main ranges; the operating data for each size (airflow, pressure, power) are determined from the catalogue curves and tables, based on the operating point of the installation.
Updated: 2026-11-12