Backward Curved EC Blowers

Not all centrifugal blowers are built the same - and the difference starts with the impeller. Backward-curved EC blowers generate airflow by creating dynamic pressure across the shorter length of their blades, meaning pressure is driven by air velocity rather than blade surface area. The result is a more efficient, lower-noise blower that performs reliably in high-volume, low-pressure applications where heat dissipation and acoustic output both matter.

Browse our selection of backward-curved EC blowers below, or contact YS Tech USA if you need a custom solution engineered to your specifications.

Fan Size

Width

Speed (RPM)

Max Airflow (CFM)

Power Consumption (W)

Life at 40°C L10 (Hours)

Noise Level (dB)

QV113341HBL-7A3

133

120 (VAC)

100~140

5330

280

95.504

1.23

60000

72.3

View Product >

QV117542HBL-7A3

175

120 (VAC)

100~140

4500

449

88.138

1.51

108

60000

75.2

View Product >

QV119045HBL-7A3

190

120 (VAC)

100~140

3750

477

100.33

1.58

120

60000

73.6

View Product >

QV122563HBL-7A3

225

120 (VAC)

100~140

2900

571

56.134

1.07

130

60000

70.3

View Product >

QV1310A0MBL-9A2

310

120 (VAC)

100~140

1500

1416

61.468

1.87

130

60000

View Product >

QV213341HBL-7A2

133

230 (VAC)

200~240

5920

289

97.536

0.95

108

60000

74.3

View Product >

QV217542HBL-7A2

175

230 (VAC)

200~240

4460

458

89.916

0.95

110

60000

75.2

View Product >

QV219045HBL-7A2

190

230 (VAC)

200~240

3590

446

105.41

0.91

106

60000

72.3

View Product >

QV222563HBL-7A2

225

230 (VAC)

200~240

2500

566

55.118

0.67

60000

66.1

View Product >

QV222563HBL-9A2

225

230 (VAC)

200~240

3400

931

106

0.85

200

60000

74.5

View Product >

QV225057MBL-9A2

250

230 (VAC)

200~240

2700

973

91.84

1.74

200

60000

View Product >

QV228080MBL-9A2

280

230 (VAC)

200~240

2300

1448

91.84

1.74

200

60000

View Product >

QV2310A0MBL-9A2

310

230 (VAC)

200~240

1500

1416

61.468

1.25

130

60000

View Product >

No results matched the selected filters.

13 Results

Choose the right blower for your needs:

Backward Curved EC

Shop Now

Forward Curved EC

Shop Now

DC Blowers

Shop Now

What is a backward-curved EC blower?

A backward-curved EC blower is a centrifugal fan that uses an electronically commutated (EC) motor paired with a backward-curved impeller. The impeller generates airflow by developing dynamic pressure through blade velocity rather than blade surface area, which makes it inherently more efficient and quieter than forward-curved designs. EC motor technology provides variable-speed control and eliminates the need for external speed controllers, reducing overall system complexity.

What is the difference between a backward curved and forward curved EC blower?

Forward curved blowers use longer blades to generate static pressure, making them well-suited for applications requiring high pressure at lower speeds. Backward-curved blowers generate pressure by directing air through shorter blades, resulting in higher efficiency and lower noise. For applications where airflow volume, energy efficiency, and acoustic performance are priorities, backward curved is typically the better choice.

What are backward curved EC blowers used for?

Backward curved EC blowers are used in applications that require high-volume, low-pressure airflow with tight noise constraints. Common applications include HVAC and ventilation systems, industrial cooling enclosures, medical equipment, telecom infrastructure, and AI/high-compute hardware where thermal density is high and acoustic limits apply.

Why choose an EC motor over a DC or AC motor in a centrifugal blower?

EC motors combine the efficiency of a brushless DC motor with compatibility with AC power, making them suitable for both single-phase and three-phase power environments. They support variable speed operation through integrated control electronics, enabling precise airflow management and significant energy savings at partial load - typically 20-30% more efficient than comparable AC motor designs. EC motors also have longer service life due to the absence of brushes and commutator wear.

What sizes of backward-curved EC blowers does YS Tech USA offer?

YS Tech USA's backward-curved EC blowers are available in multiple frame sizes to suit a range of airflow and static-pressure requirements. Use the filters above to narrow by size, or contact YS Tech USA if your application requires a custom configuration.