12" Axial AC Industrial Plastic Blower

Allegro 12" Axial AC Industrial Plastic Blower — High-Airflow Confined Space Ventilation

The Allegro 9539-12 is a 1 HP, single-phase axial blower engineered for demanding confined space ventilation in construction, industrial, and manufacturing environments. Built with a durable polyethylene housing, it delivers both positive and negative airflow, making it suitable for supply and exhaust ventilation without the need for separate equipment. Rated at 2,180 CFM free air, it is ideally suited for large confined spaces such as paper mills, tank purging, and utility sites. UL Recognized and CSA Certified, this blower meets rigorous safety standards for professional job site use.

Technical Specifications

Unlike metal axial blowers, the polyethylene housing on the 9539-12 is inherently corrosion-, UV-, and chemical-resistant, reducing maintenance demands in harsh environments. Its ability to deliver both positive and negative airflow from a single unit reduces the number of pieces of equipment a contractor needs to transport and maintain on site. The stackable design and molded carry handle further differentiate it from non-stackable alternatives when storage and portability are priorities.

Key Features & Benefits

1 HP Motor with High CFM Output

The 1 HP single-phase motor delivers 2,180 CFM of free air, making this blower capable of ventilating large confined spaces efficiently. Even with two 90° duct bends, airflow remains at 1,255 CFM, ensuring effective ventilation across longer duct runs.

Positive and Negative Airflow

The 9539-12 can be configured for both supply (positive) and exhaust (negative) ventilation, eliminating the need to purchase separate blowers for each function. This dual capability directly reduces equipment costs on the job site.

Polyethylene Housing — Corrosion, UV, and Chemical Resistant

The molded polyethylene canister assembly resists corrosion, UV degradation, and chemical exposure, extending service life in demanding industrial and outdoor environments. This makes it a more durable long-term investment compared to metal alternatives in corrosive settings.

UL Recognized and CSA Certified

The blower carries UL Recognition and CSA Certification, meeting the CSA requirements for Fans and Ventilators standard C22.2 No. 113. These certifications provide contractors with confidence that the unit meets established safety requirements for professional use.

Stackable Design with Molded Carry Handle

The stackable form factor allows multiple units to be stored compactly, saving space in work vehicles and on job sites. The carry handle is molded directly into the housing, providing a secure, integrated grip for transport without add-on hardware.

Enclosed Electrical Components and Built-In On/Off Switch

A bottom enclosure protects electrical components from debris and moisture, improving reliability in dirty or wet job site conditions. The built-in On/Off switch provides convenient, direct control without requiring external switching hardware.

Super Quiet Operation

The blower is designed for quiet operation, reducing noise fatigue for workers in confined spaces and surrounding areas during extended ventilation tasks.

Inline Booster Blower Capability

The 9539-12 can be used as an inline booster blower, acting as a velocity accelerator to extend effective duct distances when paired with a primary blower. This adds versatility for larger or more complex ventilation setups.

Common Applications

Confined Space Ventilation

Designed specifically for large confined spaces, this blower provides the airflow needed to purge hazardous gases and supply fresh air prior to and during worker entry.

Paper Mills

The chemical- and UV-resistant polyethylene housing holds up in the humid, chemically active environments common in paper mill operations.

Tank Purging

The blower's high free-air CFM rating and dual positive/negative airflow capability make it effective for rapidly removing gases from tanks before entry.

Utility Sites

Portable and durable, the 9539-12 is well suited for utility site ventilation tasks where equipment must be transported frequently and set up quickly.

Construction and Industrial Job Sites

The safety orange color provides high visibility in busy work environments, and the robust polyethylene construction withstands the rigors of construction and industrial use.

Inline Booster Applications

When used as an inline booster blower, the unit extends the effective range of a primary blower system, enabling ventilation of longer duct runs and more complex confined space geometries.

Compatible Materials

• Allegro standard ducting (recommended pairing)
• Compatible with standard 12" duct systems

Product Documents

• Allegro Ventilation Blowers Linecard

Frequently Asked Questions

Q: Can this blower be used for both supply and exhaust ventilation?
A: Yes. The 9539-12 delivers both positive (supply) and negative (exhaust) airflow, allowing it to be used for either ventilation mode without purchasing a separate unit.

Q: What is the airflow output of the 9539-12?
A: The blower delivers 2,180 CFM free air, 1,330 CFM with one 90° bend, and 1,255 CFM with two 90° bends (CFM calculated using 15' x 12" ducting; free air calculated at blower).

Q: Is this blower suitable for hazardous (explosive) environments?
A: No. The 9539-12 is a standard AC plastic axial blower and is not explosion-proof. For hazardous environments, Allegro offers separate explosion-proof models such as the 9539-12EX.

Q: Can the 9539-12 be used as an inline booster blower?
A: Yes. The blower is designed to function as an inline booster blower, serving as a velocity accelerator to extend effective duct distances when used in conjunction with a primary blower.

Q: What ducting is recommended for use with this blower?
A: Allegro recommends pairing the 9539-12 with Allegro standard ducting for optimal performance.

Q: What certifications does this blower carry?
A: The 9539-12 is UL Recognized and CSA Certified, meeting the CSA requirements for Fans and Ventilators standard C22.2 No. 113.