Backward Curved Centrifugal, Configurations

Series 03 Configurations

Hartzell offers backward curved centrifugal fans in a variety of configurations to meet your requirements. These fans have the same proven high efficiency wheel as the standard Series 03, but are packaged in various specialty configurations. Configurations include flange mount, packaged, swing out, and utility. All come in either clockwise and counterclockwise rotations.

Flange Mount:

Construction— Continuously welded hot-rolled steel scroll and continuously welded steel inlet and outlet flanges. Motor base constructed of heavy gauge hot rolled steel. Supplied with inlet mounting adapter as standard.

Rotation — Clockwise and counterclockwise.


Performance — Class II range up to 35,000 CFM; static pressure capabilities to 10” w.g.

Bearings — Heavy duty, self-aligning, ball or roller type, in cast iron pillow block housings, selected for long life at maximum Class II construction limits, and include extended lubrication fittings as standard.


Construction — Square mounting frames rather than a conventional scroll. Also available in stainless or aluminum.

Motor Location — Motors can be mounted on any side of the mounting frame.


Construction — Heavy gauge hot rolled steel. Swingout door rotates on flange mount ball bearing units for easy access. Also available in stainless or aluminum.

Rotation — Clockwise or counterclockwise in four discharge positions (TH, BH, UB, DB).

Finish — Industrial grade powder coat enamel. Other special coatings available.


Fan Inlets and Outlets — Straight inlet and outlet connections are provided for easy “slip-fit” connection to ducting. Optional drilled or undrilled outlet flanges are available.

Rotation and Discharge — Clockwise or counterclockwise rotation in all eight discharge positions.

Backward Curved Centrifugal Fan | Hartzell Air Movement

Specifications & Resources


Steel, SS304, SS316, Aluminum
0-1.5" s.p.1.5-3" s.p.3-8" s.p.