26" Axial AC Standard Metal Blower

26" Axial AC Standard Metal Blower — Highest-Output Ventilation for Large-Scale Job Sites

The Allegro 9530 is a 26" axial AC metal blower engineered to deliver the highest airflow output in the Allegro ventilation blower lineup, making it the go-to choice for contractors and safety professionals who need to move maximum air volume in large confined spaces, industrial facilities, and construction environments. Powered by a 2 HP thermally protected motor running on 115V–230V AC at 60 Hz, this blower is built for demanding applications where reliable, high-volume ventilation is non-negotiable. The heavy-duty 16-gauge cold rolled steel housing is epoxy powder-coated in safety orange for high visibility on the job site. Its interchangeable flange design allows the unit to be configured for either intake or exhaust side mounting, giving crews the flexibility to adapt to changing ventilation requirements.

Technical Specifications

The 9530 stands apart from smaller axial blowers in the Allegro lineup by delivering up to 9,570 CFM free air — significantly more than the 20" high output model's 7,500 CFM — making it the top-tier choice when large-volume air movement is the primary requirement. Unlike centrifugal blowers that are optimized for long duct runs and high back-pressure, this axial design prioritizes maximum CFM throughput for open or minimally ducted large-space ventilation. The dual-voltage motor (115V–230V) adds site flexibility, allowing the blower to operate on either standard or high-voltage circuits without modification.

Key Features & Benefits

Highest Output in the Allegro Metal Blower Line

At 9,570 CFM free air, the 9530 delivers more airflow than any other blower in the Allegro ventilation lineup. For contractors ventilating large confined spaces, tunnels, or open construction areas, this translates directly to faster air exchange cycles and reduced worker exposure time to hazardous atmospheres.

2 HP Thermally Protected Motor

The 2 HP motor provides the power needed to sustain high CFM output even under load, while the built-in thermal protection automatically safeguards the motor against overheating during extended operation. This reduces the risk of motor burnout and unplanned downtime on critical ventilation tasks.

Dual-Voltage Operation (115V–230V AC)

The motor is wired to accept both 115V and 230V AC at 60 Hz, giving crews the ability to connect to whatever power source is available on site without requiring a separate transformer or rewiring. This flexibility is especially valuable on industrial and manufacturing job sites where power configurations vary.

Interchangeable Flange for Intake or Exhaust Mounting

The flange can be repositioned to either the intake or exhaust side of the blower, allowing the same unit to push fresh air into a space or pull contaminated air out. This dual-function capability reduces the number of units a crew needs to carry and deploy.

16-Gauge Cold Rolled Steel Housing with Epoxy Powder Coat

The heavy-gauge steel housing resists denting and deformation in rough job site conditions, while the epoxy powder-coat finish provides corrosion resistance and high-visibility safety orange coloring. Integrated carry handles make repositioning the 105 lb. unit manageable for two-person crews.

Glass Reinforced Polypropylene Three-Blade Fan with Aluminum Hub

The PPG three-blade impeller combines the impact resistance and chemical resistance of glass-reinforced polypropylene with the structural rigidity of an aluminum hub. This construction is well-suited to environments where the blower may encounter airborne particulates or chemical vapors.

Steel/Chrome Plated Grill

The chrome-plated steel grill protects the impeller from accidental contact and debris ingestion while maintaining airflow efficiency. The robust grill construction is appropriate for the demanding environments — construction sites, industrial plants, and confined space entry operations — where this blower is designed to work.

Common Applications

Confined Space Ventilation

The 9530 is designed to meet the ventilation demands of confined space entry operations, providing the high CFM output needed to rapidly purge hazardous gases and introduce fresh air before and during worker entry. Per Allegro guidance, the blower should be set back a minimum of five feet from the opening to prevent purged gases from being drawn back into the intake.

Construction Site Ventilation

Large-scale construction projects — including tunnels, vaults, and below-grade structures — require high-volume air movement to control dust, fumes, and heat. The 9530's 9,570 CFM free-air output makes it effective for ventilating expansive work areas where smaller blowers would be insufficient.

Industrial and Manufacturing Facilities

In manufacturing plants and industrial facilities, the 9530 can be deployed to ventilate work areas, equipment enclosures, and process spaces where air quality must be maintained for worker safety and process integrity.

Tunnels and Underground Structures

Tunnels are listed as a primary confined space type in Allegro's application guidance. The 9530's high output and interchangeable flange make it suitable for both supply and exhaust ventilation configurations in tunnel environments.

Manholes, Vaults, and Vessels

For utility and infrastructure work involving manholes, vaults, and vessels, the 9530 provides the airflow capacity to rapidly clear hazardous atmospheres prior to and during worker entry, supporting compliance with OSHA confined space entry requirements.

Shipyard and Refinery Applications

Allegro identifies shipyards and refineries as industries that use ventilation blowers. The 9530's durable steel construction and high output make it appropriate for the large, complex spaces common in these environments.

Compatible Materials

• Ductwork (axial blowers are compatible with in-line axial booster blowers as velocity accelerators for longer duct distances)
• Manholes
• Tunnels
• Vaults
• Vessels
• Pipelines
• Silos
• Storage bins
• Hoppers
• Tanks (non-hazardous environments; for hazardous/API tank applications, explosion-proof or venturi/jet fan models are recommended)

Product Documents

• Allegro Ventilation Blowers Linecard

Frequently Asked Questions

Q: What is the maximum airflow output of the 9530?
A: The 9530 delivers 9,570 CFM free air, 8,610 CFM with one 90° bend, and 7,750 CFM with two 90° bends — the highest output of any blower in the Allegro ventilation lineup.

Q: Can this blower be used for both intake and exhaust ventilation?
A: Yes. The interchangeable flange can be repositioned to either the intake or exhaust side of the blower, allowing it to function as either a supply or exhaust ventilator depending on the application.

Q: What voltage does the 9530 operate on?
A: The motor accepts both 115V and 230V AC at 60 Hz, providing flexibility to connect to different power sources on site without additional equipment.

Q: Is this blower suitable for hazardous (explosive) atmospheres?
A: No. The 9530 is a standard (non-explosion-proof) AC metal blower intended for use in non-hazardous environments. For hazardous environments, Allegro offers explosion-proof blower models. Refer to Allegro's blower selection guidance to choose the appropriate model for your environment.

Q: How far should the blower be positioned from a confined space opening?
A: Allegro recommends setting the blower back a minimum of five feet from the opening when ventilating a manhole or tank. This prevents hazardous gases purged from the confined space from being drawn back into the blower intake and forced back into the space.

Q: Is the 9530 an axial or centrifugal blower, and what does that mean for my application?
A: The 9530 is an axial blower, which is designed for high airflow with lower pressure. Axial blowers are best suited for shorter distances with minimal ducting and bends, and for applications where portability and maximum CFM are the primary requirements. For longer duct runs with multiple 90° bends, a centrifugal blower may be more appropriate.