High-Static-Pressure AC Volute Backward Centrifugal Blowers for Industrial Ventilation & HVAC Handling

As a Chief Fan-System Engineer with 18 years designing industrial ventilation, I have found that well-designed scroll housings—not just impellers—determine whether a centrifugal fan can overcome the friction losses of modern duct systems. AFL’s AC Volute Backward Centrifugal Blower series converts kinetic velocity into reliable static pressure, delivering stable, focused airflow where high resistance once crippled performance.

Why Volute Casing Design Matters

A volute casing gradually expands the airflow path, slowing velocity and converting dynamic energy into pressure energy (Bernoulli principle). AFL’s scroll geometry is validated with CFD and laboratory testing per ISO 5801 to maximise static-to-dynamic efficiency while keeping sound power within ISO 3744 limits. The result: higher pressure at identical motor power compared with straight-housing designs.

Technical Advantages of AFL AC Volute Centrifugal Fans

• Backward-curved steel or aluminium impellers for high efficiency and self-cleaning performance

• Robust scroll housings laser-cut and seam-welded for dimensional accuracy

• Wide impeller range (160 mm – 710 mm) covering 500 m³/h to 38 000 m³/h

• Motor options: single-phase 230 V or three-phase 400 V, IP55, Class F insulation

• Factory balancing to ISO 21940 G2.5 for low vibration and long bearing life

• Optional epoxy coatings for corrosive or fume-laden air streams

Application Spectrum

In My Experience: Field-Proven Performance

Over the years, I’ve commissioned AFL volute blowers in European automotive paint lines and Southeast-Asian electronics plants. In retrofit projects, replacing forward-curved fans with AFL backward-volute units cut motor kW by 18 % and reduced filter change frequency thanks to steadier pressure. These gains were verified by on-site pitot traverses and power-meter logging over six months.

Regional Compliance & Buyer Priorities

• EU/UK: CE/LVD, ERP efficiency metrics, EN 12101-3 for smoke exhaust options

• USA: UL 705, AMCA 211/300 test data for fan curves and sound

• APAC (Korea, Malaysia, Thailand): KC, SIRIM, TISI certification; tight lead-time windows met via AFL’s Jiangsu stocking hub

Call to Action

Request performance curves, 3-D CAD, and blower selection assistance for your next project. AFL application engineers size impeller diameter, motor power, and volute outlet to match duty points precisely—no overspend on energy or footprint.

China AC Volute Centrifugal Fan Manufacturers, Suppliers, Factory

1. As an AC Volute Centrifugal Fan Manufacturer & Supplier in China, what QC standards do you follow?
   We operate under ISO 9001 and perform type testing to ISO 5801 and AMCA 210 before release.

2. Can AFL supply Industrial Blowers Manufacturer, Factory In China support for OEM brands?
   Yes—custom colour, label, and nameplate; MOQ 200 units for private branding.

3. How does volute casing improve energy efficiency?
   By diffusing airflow, the volute raises static pressure 10–15 % versus cylinder housings at equal power input.

4. What impeller materials are available from your China AC Volute Centrifugal Fan Factory?
   Standard galvanised steel, stainless 304 for corrosive gases, and aluminium for lightweight HVAC units.

5. Which fan suits high static pressure duct systems?
   The backward-curved volute series delivers up to 2 800 Pa—ideal for long duct runs or dense filters.

6. Do you offer performance curves for blower selection?
   Every model ships with AMCA-style airflow/pressure curves and efficiency maps.

7. Can the blower integrate with VFD controls?
   All three-phase motors accept VFD input; we size for 25–60 Hz with no stall.

8. What lead time does your China Industrial Blowers Factory commit to?
   6–8 weeks standard; 4 weeks for stocked impeller sizes under 400 mm.

9. How do AFL fans handle abrasive fume extraction?
   We add wear-resistant epoxy inside the volute and specify backward-inclined blades to prevent dust build-up.

10. What makes AFL different from other China Volute Casing Manufacturers, Suppliers, Factory?
    In-house laser cutting, dynamic balancing, and a dedicated ISO 3744 acoustic chamber ensure repeatable performance on every batch.

Reference Links

• Volute casing efficiency – Wikipedia

• AFL Motor – LinkedIn

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