Backward Curved Centrifugal Fans

Backward curved centrifugal fans move air through impeller blades that curve away from the direction of rotation, a geometry chosen specifically for installations where static pressure and stable power draw matter more than raw airflow volume.

CBI has manufactured centrifugal fans since 1963, with a backward curved and backward inclined range engineered for continuous industrial duty. If you're specifying a fan for a real installation, our technical team can review your operating conditions before you commit to a model.

Why Choose Backward Curved Blades

The choice between backward curved and forward curved geometry comes down to what your installation actually needs from the fan: static pressure and stability, or airflow volume and compactness.

Backward curved blades are the default for processes where operating resistance shifts with production load rather than sitting at a fixed point, because the design tolerates that variability without pushing the motor into overload.

That trade-off is exactly what determines the right series and execution for a given line: pressure and flow requirements first, then material and blade type. 

CBI's Backward Centrifugal Fan Range

CBI's centrifugal fan range covers both backward curved and backward inclined flat-blade geometries, across five series built for different pressure, flow and material requirements.

Comparison table 

Some models offer special executions, such as corrosion-resistant coatings, ATEX on request or gastight configurations, depending on the operating environment and the customer's specific needs.

Typical Applications

CBI's centrifugal fan range, backward curved series included, is deployed across:

Within that range, the operating resistance curve of the specific process, not a single headline efficiency figure, is what determines whether a backward curved geometry is the right fit for a given line.

CBI, Backward Curved Centrifugal Fan Manufacturer Since 1963

As one of Italy's backward curved centrifugal fan manufacturers, CBI designs, produces and services every unit in-house rather than assembling from third-party components. That full lifecycle control, from CFD and FEM-based engineering through production, installation, revamping and spare parts, is coordinated by CBI's own Spares & Service Division and delivered under ISO 9001 and ISO 14001 certification.

As a manufacturer rather than a distributor, CBI can adapt blade geometry, materials and execution to a specific duty cycle instead of offering a fixed catalogue range.