16" Axial AC Standard Metal Blower

Allegro 16" Axial AC Standard Metal Blower – High-Output Confined Space Ventilation

The Allegro 9515 is a 16-inch axial AC blower engineered for high-volume air movement in very large confined spaces. Powered by a 1/2 HP motor and fitted with a six-blade glass-reinforced polypropylene impeller, it delivers up to 3,400 CFM of free-air flow, making it well-suited for construction, industrial, and manufacturing environments. The 18-gauge cold rolled steel housing is epoxy powder-coated in safety orange for durability and high-visibility job site identification. Available in both US (115V AC) and international (220V AC/50 Hz) wiring configurations, it is designed to serve as either an intake or exhaust blower depending on flange orientation.

Technical Specifications

Compared to plastic axial blowers of the same diameter, the 9515's 18-gauge cold rolled steel housing provides greater structural durability in demanding job site conditions. The interchangeable flange design allows the same unit to function as either an intake or exhaust blower without additional hardware, offering flexibility that reduces the need for multiple units on a single job.

Key Features & Benefits

1/2 HP Motor with High CFM Output

The 1/2 HP motor drives up to 3,400 CFM of free-air flow, making this blower capable of rapidly ventilating very large confined spaces. Even with two 90° duct bends, airflow remains at 2,300 CFM, maintaining effective ventilation through complex duct runs.

18-Gauge Cold Rolled Steel Housing

The heavy-gauge steel housing withstands the physical demands of construction and industrial environments, resisting dents and deformation that can compromise airflow performance. The epoxy powder-coat finish in safety orange adds corrosion resistance and high-visibility identification on busy job sites.

Glass Reinforced Polypropylene Six-Blade Impeller with Aluminum Hub

The PPG fan material balances strength and weight, while the aluminum hub provides a secure, durable connection to the motor shaft. The six-blade design is optimized for the high-airflow, lower-pressure characteristics of axial ventilation.

Interchangeable Flange for Intake or Exhaust Mounting

The flange can be repositioned to either the intake or exhaust side, allowing the blower to push or draw air as the application requires. This dual-function capability eliminates the need to stock separate intake and exhaust units.

Integrated Carrying Handles

Built-in handles make it practical to transport the 47 lb. unit to and from the job site without additional lifting equipment. Easy portability is critical when ventilation equipment must be repositioned frequently across a large site.

Steel/Chrome Plated Grill

The chrome-plated steel grill protects the impeller from accidental contact and debris ingestion while maintaining airflow efficiency. Its robust construction is consistent with the overall durability focus of the metal blower line.

CSA Certified (US Version)

The 9515 is certified to CSA Standard C22.2 No. 113 (Fans and Ventilators), providing documented compliance for job sites and projects that require certified ventilation equipment. Note that the international 220V version (9515-E) does not carry this certification.

US and International Wiring Options

The availability of both 115V/60 Hz (9515) and 220V AC/50 Hz (9515-E) configurations allows contractors working on domestic and international projects to specify the correct unit for local power infrastructure.

Common Applications

Confined Space Ventilation

Designed specifically for very large confined spaces, the 9515 delivers the high CFM output needed to meet OSHA confined space entry ventilation requirements in manholes, vaults, tunnels, and similar environments.

Construction Sites

Used to supply fresh air or exhaust fumes and dust from enclosed construction areas, including below-grade work zones and partially enclosed structures.

Industrial Facilities

Suitable for ventilating large industrial spaces such as manufacturing floors, storage bins, silos, and hoppers where high-volume air movement is required.

Tunnels and Underground Work

The high free-air CFM rating and compatibility with ducting makes this blower effective for pushing or drawing air through tunnel sections and underground pipelines.

Tanks and Vessels (Non-Hazardous Environments)

Can be used to ventilate tanks and vessels in non-hazardous environments prior to entry, helping to displace stale or oxygen-deficient air. (For hazardous/explosive atmospheres, an explosion-proof model is required.)

Manufacturing and Distribution

Provides supplemental or primary ventilation in large manufacturing and distribution center spaces where fixed HVAC may be insufficient for temporary or localized air quality needs.

Compatible Materials

• Standard (non-hazardous) air environments
• Construction site atmospheres
• Industrial and manufacturing facility air
• Underground and tunnel environments (non-explosive)
• Tank and vessel interiors (non-hazardous)

Available Items

Product Documents

• Allegro Ventilation Blowers Linecard

Frequently Asked Questions

Q: Can this blower be used for both intake (supply) and exhaust ventilation?
A: Yes. The interchangeable flange design allows the unit to be mounted for either intake or exhaust side operation, so a single blower can push or draw air depending on how the flange is positioned.

Q: Is the 9515 certified for use on projects requiring CSA-approved ventilation equipment?
A: The standard 115V US version (9515) is certified to CSA Standard C22.2 No. 113. The international 220V version (9515-E) does not meet CSA C22.2 No. 113 requirements.

Q: Can this blower be used in hazardous or explosive atmospheres?
A: No. The 9515 is a standard (non-explosion-proof) axial blower and is not rated for use in hazardous environments. For explosive atmospheres, Allegro offers explosion-proof metal axial blower models (e.g., 9515-01, 9515-50EX).

Q: What is the airflow output when ducting with bends is used?
A: Free-air output is 3,400 CFM. With one 90° bend, airflow is 2,800 CFM. With two 90° bends, airflow is 2,300 CFM.

Q: What is the difference between the 9515 and the 9516 (High Output) model?
A: The 9516 is the 16" High Output Metal Blower rated at 2 HP and 5,500 CFM free air (115V–230V AC, 60 Hz, 74 lbs.), compared to the 9515's 1/2 HP and 3,400 CFM. The 9515 is the standard-output option for large confined spaces, while the 9516 is suited for applications requiring maximum airflow.

Q: When ventilating a manhole or tank, how should the blower be positioned?
A: Per Allegro's guidance, always set the blower back a minimum of five (5) feet from the opening. This prevents hazardous gases purged from the confined space from being drawn back into the blower intake and forced back into the space.