Description
AT 18-18L — Belt-Driven Forward-Curved Centrifugal Blower
The LONGWELL AT 18-18L 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 L (AT series type code). The casing measures 684×739 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 | 684 mm |
| B | 739 mm |
| C | 478 mm |
| D | 415 mm |
| E | 608 mm |
| I | 740 mm |
| J | 557 mm |
| K | 583 mm |
| L | 607 mm |
| M | 68 mm |
| N | 314 mm |
| W | 65 mm |
| X | 28 mm |
| X1 | 262 mm |
| X2 | 283 mm |
| X3 | 278 mm |
| H1 | 457 mm |
| H2 | 376 mm |
| H3 | 340 mm |
| d | 25 mm |
| t | 8 mm |
| t1 | 7 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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