Description
AT 18-18RK — Belt-Driven Forward-Curved Centrifugal Blower
The LONGWELL AT 18-18RK is a forward-curved (multi-wing) centrifugal blower from the AT belt-driven commercial range. Per the AT series type code, 18 is the impeller diameter designation and 18 the impeller width designation; Construction type RK (AT series type code). The casing measures 690×751 mm housing (dimensions A–B below). Because the fan is belt-driven, the duty point is set by the pulley ratio you choose — the figures below are the operating envelope printed on the AT 18-18 catalogue performance chart, not a single rated point.
LONGWELL states the AT series covers 1,000–40,000 m³/h overall, and is characterised by compact construction, high efficiency and low noise. Catalogue performance is quoted at standard conditions (inlet pressure 101.325 kPa).
Performance envelope
| Volume flow rate | 1,700 – 25,000 m³/h |
| Total pressure Pt | 60 – 700 Pa |
| Rotational speed | 300 – 850 rpm |
| Impeller power | 0.12 – 6 kW |
| Sound pressure level | 60 – 85 dB(A) |
| Total efficiency η | up to 58% |
The catalogue performance chart shows a separate LK–RK duty zone for the K build, which extends above the standard L–R zone.
Send us your required airflow and static pressure and our engineers will return the matching speed, pulley set and motor rating.
Dimensions (mm)
| A | 690 mm |
| B | 751 mm |
| C | 478 mm |
| D | 415 mm |
| E | 544 mm |
| F | 641 mm |
| G | 654 mm |
| H | 36 mm |
| I | 790 mm |
| J | 557 mm |
| K | 597 mm |
| L | 637 mm |
| M | 89.8 mm |
| N | 314 mm |
| R | 6 mm |
| W | 70 mm |
| X | 38 mm |
| d | 35 mm |
| t | 10 mm |
| t1 | 8 mm |
| U×S | 11×16 mm |
Letter codes correspond to the AT series dimensional drawing shown below. All values from the LONGWELL AT series catalogue.
Performance curves
Dimensional drawing
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