Model HDBI: Backward Inclined Fan

Cincinnati Fan manufactures 12 sizes of the Model HDBI Backward Inclined Fan in AMCA Class II, III, and IV construction. The Model HDBI is an excellent choice for efficient delivery of high air volumes.

All models are available with three wheel designs and in multiple widths from 50% to 100%, to deliver the exact performance you need with a direct driven fan. Four belt driven arrangements are also available. All aluminum or stainless steel construction is available.

This fan is available in AMCA A, B, or C spark resistant construction.


• Capacities up to 150,000 CFM and 25″ SPWG
• Standard construction, air stream temperatures up to 200°F (93°C)
• Optional high-temperature construction, temperatures up to 750°F (398°C)


Airflow: See Daniels Fans Model BI Industrial Fan
Pressure: See Model HPBC, Model RBE, and Model RTE
Temperature: See Daniels Fans Model BIF High Temp Fan




  • AMCA certified ratings for air performance on all models with 100% width wheels.
  • All models available with housing and wheel widths from 50% to 100%, in 5% increments, to deliver the performance you need with a direct driven blower.
  • Continuous welded housings, instead of lock seams, eliminate air leakage.
  • Heavy gauge steel bases, with internal bracing, maximize rigidity and promote long equipment life.
  • Blower housings can be rotated in 45° increments, on most sizes, to provide increased configuration flexibility in the field.
  • Removable inlet & drive side plates allow for removal of blower wheel or motor, or shaft and bearings on belt driven models, without disconnecting inlet or discharge connections.
  • Inlet side support assures a minimal vibration housing.
  • All fans receive a mechanical run test to ensure proper balance and alignment before shipping.
  • Belt driven models include heavy duty, grease lubricated, self-aligning, cast iron, and pillow block bearings selected for optimal performance.
  • Fan shaft on belt driven models is turned, ground, and polished and receives a high-quality rust preventative coating before shipment.
  • Arrangement 8 units come standard with shaft/coupling guards
  • Arrangement 9 and 9CB units come standard with belt guards.
  • Arrangement 10 units come with weather cover.
  • All models are also available in aluminum or all stainless steel construction.


  • Multiple Wheel Selections: Each size and class is available in multiple widths from 50% to 100%, in 5% increments, to deliver the exact performance you need with a direct driven blower. Complete design flexibility.
  • Rugged Construction: Housings are heavy gauge steel and are continuously welded to prevent leakage. Fan bases are 7 and 10-gauge steel with internal bracing to prevent pulsation at all conditions. Less field problems.
  • Rotatable Housings: Most models have housings that can be rotated in 45° increments in the field. Allows for field conversion without replacing the blower.
  • Ease of Maintenance: Replacing a wheel, motor, or shaft and bearings on belt driven models, is easily accomplished without disturbing the inlet and/or discharge connections. Minimizes extended downtime.
  • Quality Components: All belt driven models have self-aligning, cast iron, grease lubricated, pillow block bearings sized for a minimum 150,000 hours average life. All fan shafts are turned, ground, and polished and are coated with a high-quality rust preventative before shipment. Long dependable service.

Arrangement 1 – Belt Drive

Arrangement 4 – Direct Drive

Arrangement 4HM – Direct Drive

Arrangement 8 – Direct Drive

Arrangement 9 – Belt Drive

Arrangement 9CB – Belt Drive

Arrangement 10 – Belt Drive

Shaft Seal

Outlet Damper

Inlet Vane Control

Inspection Door

Shaft and/or Heat Slinger Guard

Inlet & Outlet Guards

Drain Connection

Inlet & Outlet Flanges
  • Material conveying
  • Cooling
  • General ventilation
  • Dust collection
  • Combustion air
  • Oven and drying systems


Exceptional local support with over 170 experienced sales engineers in 56 offices strategically located across the U.S. and Canada to assist you.