Centrifugal blower - backward inclined wheel
The industrial compromise. Straight blades set backward, welded to a backplate: less sophisticated than an airfoil wheel, more forgiving of dust, easier to inspect and easier to rebuild - and still non-overloading on the power curve.
Illustrative 3D render of a representative backward inclined build, not a photograph of a shipped unit.
Ranges are the family envelope our own product pages publish. The order always confirms against an approved GA drawing with the duty point, speed and absorbed power for your installation.
Selection logic
A backward inclined wheel is a set of flat plates, angled backward from the direction of rotation and welded between a backplate and a front ring. There is no curved passage to erode into a shallow scoop, no thin airfoil section to punch through. That single geometric fact is why this wheel ends up on so many exhaust fans in Indian industry: it keeps making pressure after the dust has been at it for a season.
The published envelope for our build is 1,300 to 3,85,000 CMH at 0.25 to 6 inWC static – about 6 to 152 mmWC – with gas to 250 C. Efficiency stays high for a robust wheel and the power curve keeps its non-overloading shape, so an operator opening a damper cannot burn the motor out.
A welded plate wheel can be scraped, hard-faced and put back in service. When the fan is on a shutdown clock that matters more than two points of efficiency.
Build
Duty fit
Choose it when the gas is dirty enough to hurt a curved wheel but not so heavy that only a radial blade will survive: cement plant auxiliary duty, weld fume, machining mist, bag filter and cyclone service after the primary arrester, chemical and fertiliser plant exhaust, dryer off-gas. It is also the sane choice on a retrofit where the existing base, belt and motor must be reused.
Where the pressure demand is above roughly 150 mmWC, or the conveying line is long, we move you up to the high pressure radial blade. Where the gas is genuinely clean and the running hours are high, the backward curved wheel earns back its extra cost in electricity.
Range
| Parameter | Backward Inclined Blower | Backward Curved Blower | Industrial Exhauster Radial Shrouded Blower |
|---|---|---|---|
| Airflow | 1,300 to 3,85,000 CMH | 14,000 to 7,50,000 CMH | 400 to 1,50,000 CMH |
| Static pressure | 6 to 152 mmWC (published as 0.25 to 6 inWC) | 40 to 2,000 mmWC | 100 to 2,000 mmWC |
| Gas temperature | Up to 250 C | Up to 200 C | Up to 200 C on this build; higher tiers by arrangement |
| Impeller / frame | Impeller 250 to 2,200 mm (range-wide) | Impeller 250 to 2,200 mm (range-wide) | Impeller 250 to 2,200 mm (range-wide) |
Blank cells mean the figure is not published for that family — ask us and we will confirm it against your duty.
Questions
Inclined, in most cases. The flat blade resists erosion better and can be hard-faced and rebuilt. Curved wins where the air is clean and the fan runs 8,000 hours a year, because the efficiency gap shows up on the electricity meter.
Because that is how our own product data is written for this family. 0.25 to 6 inWC is about 6 to 152 mmWC. We will restate the duty in whichever unit your system designer uses.
Yes – send the nameplate, a photo of the base and the discharge orientation. We match the duty and the footprint, then confirm absorbed power against your existing motor before anything is cut.
Airflow and pressure are always quoted at the actual gas density. Altitude, temperature and duct losses move the number — run it through the worksheet before you send it.
Straight-through air at low pressure: tube axial, vane axial and propeller builds in mild steel and aluminium.
High static efficiency, non-overloading power curve. The default wheel for clean and lightly loaded air at medium to high pressure.
Straight radial blades, PH type: the wheel for conveying pressure, abrasive dust and long lines.
Enquiry
Tell us the duty and the constraints. You get a selection, a build sheet and a price from the works — not a call centre.
