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Whirlwind R4247 Regenerative Blower 1-inch Ports — main product image
Whirlwind R4247 Regenerative Blower 1-inch Ports
Whirlwind R4247 Regenerative Blower 1-inch Ports
Whirlwind R4247 Regenerative Blower 1-inch Ports
Whirlwind

Whirlwind R4247 Regenerative Blower 1-inch Ports

Compact, dual-voltage regenerative blower delivering reliable continuous airflow with a long-life non-contact impeller design.

$659.00*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Whirlwind R4247 Regenerative Blower is a purpose-built air delivery unit designed primarily for aerobic wastewater treatment systems, including the Hoot/TroyAir H500, H600, and Bio-Microbics/MicroFAST 05 and 0.625 models. Powered by a 1/4 HP high service factor motor, it delivers up to 42 CFM of maximum airflow and a maximum continuous operating pressure of 1.31 PSI, with a recommended steady-state output of 12 CFM at 1.11 PSI for sustained reliability.

A key engineering feature of the R4247 is its non-contact impeller, which spins without physically touching internal surfaces. This eliminates friction-based wear, dramatically extending the blower's service life and reducing the need for routine maintenance. The unit ships pre-wired for 120VAC with an attached cord and plug, but its dual-voltage design also supports 220VAC operation for international or high-voltage circuit installations. Weighing 16.5 pounds and measuring just 7.75" x 7.75" x 8.125", the R4247 fits compactly into equipment enclosures while delivering the consistent, dependable airflow that aerobic treatment systems require for proper biological processing.

Key Features

Special motor for long service life

Dual voltage (prewired 120VAC cord)

1" ports

Non-contact impeller

Compact size

Specifications

Brand
Whirlwind
Model
R4247
Motor
1/4 HP High Service Factor
Max Air Flow
42 CFM
Max Continuous Operating Pressure
1.31 PSI
Recommended Operating Air Flow
12 CFM @ 1.11 PSI
Voltage
Dual Voltage 120VAC/220VAC (Pre-wired 120VAC)
Amperage
5.0A at 110-120V / 2.5A at 220-240V
RPM
3600
Port Size
1 inch
Weight
16.5 lbs
Dimensions
7.75"L x 7.75"W x 8.125"H

Pros & Cons

👍 Pros

  • Non-contact impeller design significantly reduces internal wear, extending service life compared to direct-contact blower designs.
  • Dual-voltage capability allows use on both 120VAC and 220VAC circuits without purchasing a separate unit.
  • Compact dimensions of 7.75" x 7.75" x 8.125" fit easily into confined installation spaces.
  • Ships pre-wired with cord and plug for 120VAC, enabling faster out-of-the-box installation.
  • High service factor motor is rated for continuous duty operation.

👎 Cons

  • Maximum airflow of 42 CFM may be insufficient for larger-capacity treatment systems.
  • The 1-inch port size limits compatibility with systems requiring larger diameter connections without adapters.
  • At 16.5 pounds, the unit is heavier than some comparable compact blowers, which can complicate overhead or wall-mounted installations.
  • The 1/4 HP motor draws 5.0 amps at 120V, which should be factored into circuit load planning.

Frequently Asked Questions

The R4247 is designed for use with Hoot/TroyAir H500 and H600 systems, as well as Bio-Microbics/MicroFAST 05 and 0.625 systems.
Yes, it ships pre-wired for 120VAC with an attached cord and plug, but it is dual-voltage capable and can be reconfigured for 220VAC operation.
The non-contact impeller does not physically touch other internal components during operation, which reduces wear, minimizes maintenance, and extends the overall service life of the unit.
The recommended continuous operating airflow is 12 CFM at 1.11 PSI, which provides optimal performance and longevity for the motor.
The unit weighs 16.5 pounds, making it relatively manageable for installation in tight spaces.

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