Dual Inlet Forward Curved Blowers

Dual Inlet Forward Curved Blowers — selection guide

Dual Inlet Forward Curved Blowers: 70 models, impellers Ø120–355 mm, maximum airflow 278–8,799 m³/h, static pressure to 5,401 Pa, AC, EC and DC motors, across 20 series. 69 of them carry a measured P-Q curve and 70 a dimensional drawing.

Dual inlet forward curved blowers draw air from both sides of a multi-vane impeller in a scroll housing, which gives more airflow per diameter than any other centrifugal type at low and medium pressure. The line runs from Ø120 to Ø355 mm: LWFA2E120 / 133 / 146 AC blowers, LWFD3G133 / 146 DC blowers (24 / 48 / 310 V) and LWFE3G EC blowers from Ø120 to Ø355 mm, with rotor 92 on most compact sizes and 102 / 138 on the larger ones.

The Ø120–146 mm sizes (52 models) are the classic fan coil and compact AHU blowers; the Ø180–355 mm sizes serve packaged air conditioners, heat-recovery units and ovens.

How to select from this range

1. Rate on total pressure at the scroll outlet, including the duct or grille downstream.
2. Keep the inlet clear on both sides — the second inlet is where the extra airflow comes from.
3. Forward curved blowers are overloading: check motor power at the lowest resistance the system can reach, not only at the design point.
4. Choose EC (LWFE3G) for fan coil units with modulating control, DC (LWFD3G) for 24 / 48 V and DC-link equipment, AC (LWFA) for fixed-speed units.

Where these fans are used

• Fan coil units
• Compact and packaged AHUs
• Heat-recovery ventilation units
• Ovens and dryers

Every figure above is measured on our own test rigs per AMCA 210 / ISO 5801 methods — see the test labs and certificates. Final selection is confirmed at the duty point and by project validation.

FAQ — Dual Inlet Forward Curved Blowers

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