Description
AT 7-7L — Belt-Driven Forward-Curved Centrifugal Blower
The LONGWELL AT 7-7L is a forward-curved (multi-wing) centrifugal blower from the AT belt-driven commercial range. Per the AT series type code, 7 is the impeller diameter designation and 7 the impeller width designation; Construction type L (AT series type code). The casing measures 312×328 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 7-7 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 – 8,000 m³/h |
| Total pressure Pt | 30 – 950 Pa |
| Rotational speed | 600 – 2,400 rpm |
| Impeller power | 0.02 – 2 kW |
| Sound power level LwiA | 55 – 90 dB(A) |
| Total efficiency η | up to 50% |
Send us your required airflow and static pressure and our engineers will return the matching speed, pulley set and motor rating.
Dimensions (mm)
| A | 312 mm |
| B | 328 mm |
| C | 228 mm |
| D | 192 mm |
| E | 180 mm |
| I | 370 mm |
| J | 259 mm |
| K | 279 mm |
| L | 299 mm |
| M | 32 mm |
| N | 152 mm |
| W | 30 mm |
| X | 22.5 mm |
| X1 | 90 mm |
| X2 | 90 mm |
| X3 | 90 mm |
| H1 | 224 mm |
| H2 | 164 mm |
| H3 | 164 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
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