16" Axial AC Industrial Plastic Blower

Allegro 9539-16 16" Axial AC Industrial Plastic Blower — High-Output Confined Space Ventilation

The Allegro 9539-16 is a 1 HP, 16-inch axial AC industrial plastic blower engineered for high-volume air movement in large confined spaces. Built from corrosion-, UV-, and chemical-resistant polyethylene and rated at 3,200 CFM free air, it is ideally suited for demanding environments such as paper mills, tank purging, utility sites, and industrial construction applications. The blower supports both positive (supply) and negative (exhaust) airflow from a three-blade polypropylene fan, giving crews the flexibility to ventilate or exhaust a space with a single unit. Certified to UL, CSA Standard C22.2 No. 113, and CE standards, it meets the compliance requirements for professional confined space work.

Technical Specifications

Compared to centrifugal blowers, the 9539-16 delivers high airflow at lower cost and weight, making it the preferred choice when portability and cost are major factors and ducting runs are relatively short. Unlike smaller axial models in the Allegro line, the 16-inch industrial format delivers 3,200 CFM free air — matching the output of the standard 16-inch plastic blower series while incorporating the industrial-grade housing and enclosed electrical components designed for harsher job-site conditions. It can also be deployed as an inline booster blower to extend effective duct distances when paired with a primary blower.

Key Features & Benefits

1 HP Motor with 3,200 CFM Free Air Output

The 1 HP motor drives 3,200 CFM of free-air flow, dropping to 2,350 CFM through one 90° bend and 2,250 CFM through two 90° bends — performance that makes it practical for large confined spaces where rapid air exchange is critical. This output level is well-suited for paper mills, tank purging, and large utility vaults where smaller blowers would require excessive run time.

Bidirectional Airflow (Positive and Negative)

The three-blade polypropylene fan delivers both positive (supply) and negative (exhaust) airflow, allowing a single unit to either push fresh air into a space or pull contaminated air out. This dual-mode capability reduces the number of pieces of equipment a crew needs to bring to a job site, lowering overall equipment costs.

Corrosion-, UV-, and Chemical-Resistant Polyethylene Housing

The polyethylene housing and canister assembly resist corrosion, UV degradation, and chemical exposure — properties that extend service life in the harsh environments where industrial blowers are routinely deployed. This durability reduces replacement frequency and supports a lower total cost of ownership over the life of the equipment.

Enclosed Electrical Components with Bottom Enclosure

A dedicated bottom enclosure protects the electrical components from debris, moisture, and incidental contact on the job site. This design detail reduces the risk of electrical faults and unplanned downtime in dirty or wet work environments.

Molded Carry Handle with Built-In On/Off Switch

The carry handle is molded directly into the housing, providing a secure, ergonomic grip for transport without adding a separate attachment point that could fail. The integrated On/Off switch allows the operator to control the blower without releasing their grip or reaching for a separate control.

Stackable Design and Lightweight Construction

At 40 lbs., the 9539-16 is manageable for a single worker to transport to and from the job site. The stackable design allows multiple units to be stored compactly in a service vehicle or storage area, reducing the footprint required when multiple blowers are part of a confined space program.

Safety Orange Color for High Visibility

The safety orange finish makes the blower highly visible in busy work environments, reducing the risk of trip hazards or accidental contact in areas with heavy foot traffic or equipment movement.

Inline Booster Blower Capability

The 9539-16 is designed to function as an inline booster blower, acting as a velocity accelerator when longer duct distances are required. This extends the effective reach of a ventilation system without requiring a separate, purpose-built booster unit.

Common Applications

Paper Mills

The chemical-resistant polyethylene housing and high 3,200 CFM output make this blower well-suited for ventilating large process areas and confined spaces within paper mill facilities.

Tank Purging

The bidirectional airflow capability allows crews to rapidly push or remove air from tanks prior to entry, supporting hazard gas removal in compliance with confined space entry procedures. Per Allegro guidance, the blower should be set back a minimum of five feet from the tank opening to prevent purged gases from being drawn back into the intake.

Utility Sites and Vaults

The portable, lightweight design allows the blower to be quickly deployed at utility vaults, manholes, and similar confined spaces where rapid ventilation is required before worker entry.

Industrial and Manufacturing Facilities

High-volume airflow and durable construction make the 9539-16 appropriate for general industrial ventilation tasks in manufacturing environments where air quality must be maintained in enclosed or semi-enclosed work areas.

Construction Confined Spaces

On active construction sites, the blower can ventilate tunnels, pipelines, silos, hoppers, and other confined spaces encountered during civil and structural work.

Inline Booster for Extended Duct Runs

When used as an inline booster blower in series with a primary unit, the 9539-16 extends the effective ventilation distance for longer duct runs or systems with multiple 90° bends.

Compatible Materials

• Allegro standard ducting (recommended pairing)
• Compatible with standard axial blower ducting systems

Product Documents

• Allegro Ventilation Blowers Linecard

Frequently Asked Questions

Q: What is the airflow output of the 9539-16 with ducting installed?
A: Free air output is 3,200 CFM. With one 90° bend, airflow is 2,350 CFM; with two 90° bends, airflow is 2,250 CFM. CFM figures with bends are calculated using 15-foot x 8-inch ducting per Allegro's published data.

Q: Can this blower be used to exhaust air as well as supply it?
A: Yes. The three-blade polypropylene fan supports both positive (supply) and negative (exhaust) airflow, allowing the unit to either ventilate or exhaust a confined space depending on how it is positioned.

Q: Is the 9539-16 suitable for hazardous (explosive) atmospheres?
A: No. The 9539-16 is a standard AC industrial plastic blower and is not explosion-proof. For hazardous environments, Allegro offers the 9539-16EX, a 16-inch axial explosion-proof industrial plastic blower rated for use in those conditions.

Q: What ducting is recommended for use with this blower?
A: Allegro recommends pairing the 9539-16 with Allegro standard ducting. The blower can also be used as an inline booster blower with compatible axial blower ducting systems.

Q: How far should the blower be positioned from a manhole or tank 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: What certifications does the 9539-16 carry?
A: The blower is UL Recognized, CSA Certified to Standard C22.2 No. 113 (Fans and Ventilators), and CE Certified, meeting the compliance requirements for professional confined space ventilation in North American and applicable international markets.