Industrial Centrifugal Blower for Ventilation, Exhaust & Process Air

Here is the general-purpose industrial centrifugal blower from Slovdson. The backward-inclined centrifugal blowers handle flows from under 1,000 m³/h to over 650,000 m³/h, with total pressure development from ~170 Pa to ~6,500 Pa. The impeller spans from 280 mm (2.8#) to 2,800 mm (28#). You get direct drive for compact, low-maintenance installations, belt drive when you need speed flexibility, or coupling drive for the largest units.

Compared to a roots blower, the industrial centrifugal is mainly built for the three jobs that factories, power plants, and processing facilities need every day:

• Ventilation – moving fresh air in;
• Exhaust – pulling stale or contaminated air out;
• Process air – delivering air under pressure to a specific piece of equipment.

If your application is factory air exchange, boiler combustion air, dust collection system exhaust, process drying, or any industrial air-moving task that needs reliable high-volume operation year after year — this is where you start.

For an overview of our full centrifugal blower and fan product line — including forward-curved blowers, high-pressure centrifugal blowers, radial-blade dust exhaust fans, and specialty boiler draft fans — see our Centrifugal Fans & Blowers directory page.

Where These Industrial Centrifugal Blowers Are Used

Factory and Warehouse Ventilation

The most common application. Roof-mounted or wall-mounted centrifugal blowers continuously exchange building air — pulling out heat, fumes, dust, and humidity while supply units bring in fresh outside air. For large open manufacturing floors, multiple blowers are arranged to create cross-ventilation that reaches every work zone. The backward-inclined impeller’s 80–89% efficiency matters here because these blowers often run 16–24 hours a day — a 5% efficiency difference compounds into real electricity cost over the blower’s 15–20 years’ service life.

Process Air Supply

Delivering clean air to equipment that needs it: combustion air to burners and industrial furnaces, cooling air to heat exchangers and motor enclosures, drying air to product ovens and spray dryers, and conveying air to pneumatic transport systems. Process air applications typically run continuous duty, which means blower reliability is non-negotiable. The YX series bearing assembly — deep groove ball bearings on smaller sizes, spherical roller bearings on larger ones, all with extended grease nipples for in-service lubrication — is designed for uninterrupted operation between scheduled shutdowns.

Dust Collection and Fume Extraction

Connected downstream of baghouses, cartridge collectors, cyclone separators, or wet scrubbers. The blower pulls contaminated air through the filtration system and exhausts cleaned air to atmosphere. For heavy dust-loading applications — foundries, cement plants, grain handling, woodworking — the standard backward-inclined YX impeller works well with clean, dry dust. If the dust is abrasive or the loading is high, our YXC46/YXC48 dust exhaust series with reinforced radial-blade impellers is the more durable choice. → Tell us about your dust when you inquire; we’ll recommend the right impeller type.

Boiler Forced and Induced Draft

Forced draft (FD): pushing combustion air into the boiler burner. Induced draft (ID): pulling flue gas through the boiler passes, economizer, emissions control equipment, and up the stack. Boiler draft blowers operate at elevated temperatures (flue gas at 150–250°C) and must maintain stable flow as the boiler ramps up and down. The YX backward-inclined platform underpins our GY and YX38/39/47/48 boiler-specific series — with the same impeller geometry, upgraded with high-temperature bearings, shaft seals, heat slingers, and alloy-steel shafts for the hot end.

Construction — How the YX Industrial Centrifugal Blower Is Built

Housing — Welded Steel Volute

The volute is a spiral-shaped welded steel casing whose internal cross-section expands continuously from the cut-off point to the discharge flange. This expanding geometry converts velocity (the air leaves the impeller blade tips at high speed) into usable static pressure at the discharge. For sizes up to ~800 mm impeller, the housing is self-supporting — the motor and bearing pedestal mount directly to it. For larger sizes, the housing is internally ribbed for stiffness, and the bearing assembly sits on a separate steel baseplate, grouted to the foundation.

The discharge angle is fixed at manufacture: clockwise or counterclockwise rotation, 0° to 270° in 45° steps. It cannot be changed afterward, so specify your duct layout orientation when ordering.

Impeller — Backward Inclined, 12 Blades

Twelve wing-shaped steel blades welded between a curved front shroud and a flat back plate. The blades lean away from the direction of rotation — backward inclined. Three things follow from this geometry that matter in daily operation:

1. High efficiency. 80–89% at the design operating point. Better than forward-curved (~60–75%) or radial (~65–75%) at the same size and speed.
2. Non-overloading power curve. The motor’s power draw peaks near the design point and decreases if system resistance drops (e.g., a damper fails open or ductwork disconnects). The motor won’t burn out from an unexpected low-resistance condition — a genuine safety advantage in industrial environments.
3. Stable, surge-free operation. The pressure-versus-flow curve rises continuously with no stall dip. The blower operates stably from wide-open flow down to shut-off without the pulsation (surge) that can occur with some axial and forward-curved designs.

Every impeller is statically and dynamically balanced to ISO 1940 G6.3 before assembly.

Inlet Cone — Streamlined Entry

A convergent bell-mouth bolted to the housing inlet side. The smooth contour minimizes turbulence at the air entry point and guides flow evenly into the impeller eye. On sizes above 1,250 mm impeller diameter, internal radial vanes (a flow straightener) cancel any pre-swirl in the incoming air that would otherwise reduce blower performance.

Transmission — Three Drive Options

• A-type — Direct drive. The impeller is mounted directly on the motor shaft. No belts, no pulleys, no alignment. The motor face bolts to a bracket on the housing inlet. Compact, low-maintenance. For blowers up to ~630 mm impeller and ~30 kW. Motor speed = blower speed, so flow is fixed unless a VFD controls the motor.
• C-type — Belt drive. Motor and blower shaft connected by V-belts and tapered-bush pulleys. The motor sits on a slide base beside the blower housing. This belt-driven centrifugal blower configuration lets you adjust speed by changing pulley ratios. Belt drive also isolates the motor from blower vibration and absorbs shock loads if the system resistance changes suddenly. The most common choice for mid-size industrial blowers (800–1,600 mm impeller). Belts need quarterly tension checks and annual replacement in continuous duty.
• D-type — Coupling drive. Motor and blower shaft connected by a flexible grid or disc coupling on a shared baseplate. For large blowers (above ~200 kW, above ~1,600 mm impeller) where power levels exceed what belts can reliably transmit. The motor can be positioned away from the blower inlet — important for high-temperature applications where you want distance and a heat slinger between the hot gas stream and the motor.

YX68 Series — Performance Specifications (Excerpt)

Standard reference conditions: inlet air at 20°C, 101,325 Pa, density 1.2 kg/m³. Performance at other temperatures, altitudes, or gas densities requires correction — contact us for an adjusted selection.

The table shows one common operating point per size. Each belt-drive size (C-type) is available at multiple speeds — swap pulleys and the blower follows the fan laws: flow scales linearly with speed, pressure scales with speed², power scales with speed³. If your required operating point falls between two table entries, a slight speed adjustment usually hits it precisely.

Full centrifugal blower curve data (pressure vs. flow, power vs. flow, efficiency vs. flow) for every size and speed is available on request. The centrifugal blower pressure range across the YX68 series spans approximately 170 Pa to 6,500 Pa depending on size and speed selection.

YX72 Series — Performance Specifications (Excerpt)

Same backward-inclined impeller geometry and welded steel housing as the YX68. The YX72 extends to 28# (2,800 mm impeller) for larger flow requirements. Peak efficiency reaches 88–89% on the larger sizes.

For continuous-duty applications — blowers running 8,000+ hours per year — selecting within 10% of the peak efficiency point typically saves enough electricity over the blower’s service life to offset the incremental cost of a larger, slower-running size. Our application engineers can run this trade-off calculation for your specific operating point and local electricity rate.

Customization Options

Every YX series industrial centrifugal blower can be specified with application-appropriate modifications:

• Explosion-proof. For flammable gas or combustible dust atmospheres. Certified explosion-proof motor. Impeller and inlet cone in spark-resistant materials — aluminum or brass — so incidental contact between the impeller and housing cannot produce an ignition source.
• High-temperature. For flue gas, kiln exhaust, and dryer exhaust up to 250°C inlet. The motor is thermally separated from the hot gas by a shaft seal, heat slinger, and extended bearing pedestal. High-temperature grease in the bearings. Above 150°C, the shaft and impeller material may be upgraded to alloy steel (40Cr / 42CrMo).
• Corrosion-resistant. For chemical vapors, marine salt spray, and acid-laden exhaust. Housing and impeller in stainless steel 304 or 316. Internal anti-corrosion coatings available as a lower-cost alternative for mildly corrosive service.
• Wear-resistant. For abrasive dust. Hard-facing weld overlay on impeller blade leading edges and the volute cut-off tongue — the two surfaces that see the highest particle impact velocity. Replaceable bolt-on wear plates inside the housing for the areas between scheduled rebuilds.
• Outlet position. Clockwise or counterclockwise rotation. Discharge angle 0° to 270° in 45° increments. Fixed at manufacture.
• Motor. Standard: 380V 3-phase 50 Hz. Also available: 220V, 440V, 480V, 60 Hz, 6000V, 10000V. Direct drive, belt drive, or coupling drive as discussed above.

Installation Essentials

Foundation. Level concrete pad. For blowers above 30 kW, non-shrink grout the baseplate after alignment to ensure full-surface bearing contact and eliminate vibration-amplifying voids. Spring or neoprene vibration isolators between the baseplate and foundation reduce structure-borne noise.

Duct connections. Flexible connectors (canvas or rubber) at both the inlet and discharge flanges isolate blower vibration from the ductwork. The inlet duct must be straight for at least three duct diameters before the blower inlet — an elbow, tee, or damper immediately upstream creates non-uniform flow into the impeller, which causes unbalanced blade loading, increased noise, and a measurable drop in blower performance.

Access clearance. Leave enough space on the inlet side to withdraw the impeller and shaft assembly axially. This is the standard procedure for bearing replacement and impeller inspection. Required clearance ≈ impeller diameter + shaft length between bearing housing and impeller hub.

Maintenance.

• Bearings: grease every 2,000–4,000 hours depending on speed and temperature. Use the grease grade and quantity on the bearing nameplate.
• Belts (C-type): check tension monthly. Replace annually in continuous duty, or at any sign of cracking, glazing, or uneven side wear. Check sheave alignment with every belt change.
• Impeller: inspect annually for dust buildup, corrosion, or erosion. Clean or repair as needed. Re-balance after any material removal or weld repair.
• Vibration: for blowers above 75 kW, periodic vibration readings at the bearing housings catch developing imbalance, misalignment, or bearing wear before they become failures.

Frequently Asked Questions

What’s the difference between YX68 and YX72?

Both are backward-inclined industrial centrifugal blowers with near-identical impeller and housing design. The practical difference is size range: YX68 goes from 2.8# to 25# (280–2,500 mm impeller), YX72 extends to 28# (2,800 mm). For most applications under ~200,000 m³/h, both series offer suitable sizes and the final choice depends on which size-and-speed combination matches your operating point most efficiently. We check both series and select the best fit.

Is this a backward-inclined centrifugal blower and why does it matter?

Yes — the YX68 and YX72 use backward-inclined impellers (blades lean away from rotation). This is the standard design for industrial ventilation blowers because it delivers three things: high efficiency (80–89%), a non-overloading motor characteristic (if a damper fails open, the motor current drops rather than spiking), and stable operation across the full flow range without surging. If your application involves clean to mildly dusty air, backward inclined is the right choice.

What are the main centrifugal blower types and which one do I need?

The main centrifugal blower types are defined by impeller blade shape: backward inclined (high efficiency, non-overloading — what the YX series uses), forward curved (more compact, more pressure per diameter, but less efficient — common in furnace blowers and residential HVAC), radial blade (self-cleaning, handles heavy dust — for dust collection and material handling), and airfoil (premium efficiency up to 92% — for large HVAC and power generation). If you’re ventilating a factory, moving process air, or exhausting clean-to-moderately-dusty air, backward inclined is almost certainly what you need. For heavy dust or specialized requirements, tell us about your application, and we’ll recommend the right type.

Can I get a blower with motor and complete performance data?

Yes — every YX series blower is supplied as a complete centrifugal blower with motor, baseplate, and inlet cone as standard. We provide the full centrifugal blower curve (pressure, power, and efficiency vs. flow) for your selected operating point so you can verify stable operation across your system’s full operating range before ordering. If you need a compact 1 hp (~0.75 kW) centrifugal blower or a large industrial blower rated at 200 kW+, we cover the full range within the YX series.