Description
AT 9-9L — Belt-Driven Forward-Curved Centrifugal Blower
The LONGWELL AT 9-9L is a forward-curved (multi-wing) centrifugal blower from the AT belt-driven commercial range. Per the AT series type code, 9 is the impeller diameter designation and 9 the impeller width designation; Construction type L (AT series type code). The casing measures 380×387 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 9-9 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 | 400 – 9,000 m³/h |
| Total pressure Pt | 70 – 1,000 Pa |
| Rotational speed | 600 – 1,900 rpm |
| Impeller power | 0.02 – 3 kW |
| Sound power level LwiA | 55 – 85 dB(A) |
| Total efficiency η | up to 63% |
Send us your required airflow and static pressure and our engineers will return the matching speed, pulley set and motor rating.
Dimensions (mm)
| A | 380 mm |
| B | 387 mm |
| C | 262 mm |
| D | 215 mm |
| E | 300 mm |
| I | 447 mm |
| J | 298 mm |
| K | 324 mm |
| L | 348 mm |
| M | 51 mm |
| N | 185 mm |
| W | 30 mm |
| X | 22.5 mm |
| X1 | 119 mm |
| X2 | 124 mm |
| X3 | 123 mm |
| H1 | 253 mm |
| H2 | 199 mm |
| H3 | 177 mm |
| d | 20 mm |
| t | 6 mm |
| t1 | 6 mm |
Letter codes correspond to the AT series dimensional drawing shown below. All values from the LONGWELL AT series catalogue.
Performance curves
Dimensional drawing
The Company Longwell Leading Fan and Motor Innovator Worldwide
As a leading supplier of ventilation and drive technology, LONGWELL is a highly respected engineering partner in many industries. With over than 20,000 different products, we provide the right solution for every need. And we have always worked according to the highest economic and ecological standards.
LONGWELL Product Line
LONGWELL Certificate
Reviews
There are no reviews yet.