Allegro 12" Axial Explosion-Proof Industrial Plastic Blower — Safe Ventilation for Hazardous Confined Spaces
The Allegro 9539-12EX is a 12-inch axial explosion-proof (EX) industrial plastic blower engineered for ventilating large confined spaces in statically conductive and hazardous environments. Powered by a 1/3 HP single-phase motor at 115V AC, it meets Class I, Divisions 1 and 2, Groups C and D and Class II, Divisions 1 and 2, Groups F and G hazardous location requirements, making it suitable for environments where flammable gases, vapors, or combustible dusts may be present. The polyethylene housing is lightweight, corrosion-resistant, UV-resistant, and chemical-resistant, delivering long-term durability in demanding industrial, construction, and manufacturing settings. UL Recognized and CSA Certified to CSA Standard C22.2 No. 113, this blower is a code-compliant solution for contractors and safety professionals who cannot compromise on ventilation reliability.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | ALLEGRO |
| SKU / Order No. | 9539-12EX |
| UPC | 741851953939 |
| Blade Size | 12" |
| Motor | 1/3 HP, single-phase |
| Voltage | 115V AC, 60 Hz |
| Airflow — Free Air | 1,475 CFM |
| Airflow — One 90° Bend | 1,300 CFM |
| Airflow — Two 90° Bends | 1,200 CFM |
| Housing Material | Polyethylene |
| Color | Safety Orange |
| Weight | 25 lbs. (blower only per linecard) / 32 lbs. (per product listing) |
| Country of Origin | United States |
| Hazardous Location Rating | Class I, Divisions 1 and 2, Groups C and D; Class II, Divisions 1 and 2, Groups F and G |
| Certification | UL Recognized; CSA Certified to CSA Standard C22.2 No. 113 |
| Applications | Construction, Industrial, Manufacturing, Confined Space |
| Technical Tips | Pair with Allegro statically conductive ducting |
| Plug Type | NEMA rated 115V plug (explosion-proof socket required, sold separately) |
| Blower Type | Axial, Explosion-Proof (EX) |
Airflow Performance
| Condition | CFM |
|---|---|
| Free Air | 1,475 CFM |
| One 90° Bend | 1,300 CFM |
| Two 90° Bends | 1,200 CFM |
Note: CFM calculated using 15' x 12" ducting. Free Air calculated at blower.
Available Items
| Item # | Description | Size |
|---|---|---|
| 9539-12EX | 12" Axial Explosion-Proof (EX) Industrial Plastic Blower | 12" |
Compared to standard axial blowers, the 9539-12EX delivers certified explosion-proof performance in a lightweight polyethylene housing — eliminating the added weight and corrosion concerns associated with metal EX blowers. Its stackable design and molded carry handle reduce storage footprint and improve job-site mobility without sacrificing the high-output airflow required for large confined space ventilation. The ability to operate in both supply (positive) and exhaust (negative) airflow modes further reduces the need for additional equipment on complex ventilation setups.
Key Features & Benefits
Explosion-Proof (EX) Certification
Meets Class I, Divisions 1 and 2, Groups C and D and Class II, Divisions 1 and 2, Groups F and G hazardous location requirements, and is UL Recognized and CSA Certified to CSA Standard C22.2 No. 113. Contractors working in environments with flammable gases, vapors, or combustible dusts can deploy this blower with confidence in its compliance and safety rating.
Lightweight Polyethylene Housing
The polyethylene canister and blower housing is corrosion-resistant, UV-resistant, and chemical-resistant, making it significantly lighter than metal explosion-proof alternatives. This reduces fatigue during transport and setup, particularly important when moving equipment in and out of confined spaces repeatedly throughout a shift.
Dual-Direction Airflow (Supply and Exhaust)
The 9539-12EX can be configured to ventilate (supply fresh air) or exhaust (remove contaminated air) from a confined space. This dual-mode capability reduces the number of blowers a crew needs to purchase and transport, lowering overall equipment costs on the job.
Booster Blower Compatible
Can be used as a booster blower in-line with other axial blowers to extend effective duct distances and maintain adequate airflow in longer or more complex ventilation runs. This makes it a versatile component in multi-blower confined space ventilation systems.
Molded Carry Handle and Stackable Design
The carry handle is molded directly into the blower and canister housing for secure, ergonomic transport. The stackable design allows multiple units to be stored compactly, saving space in work vehicles and on job sites.
Bottom Enclosure for Electrical Component Protection
A bottom enclosure shields the electrical components from debris, moisture, and contaminants encountered in industrial and construction environments. This protection contributes to longer blower life and lower total cost of ownership over time.
"Safety Orange" High-Visibility Color
The safety orange color ensures the blower is easily visible in busy, congested work environments, reducing the risk of trip hazards and improving overall job-site safety awareness.
Super Quiet Operation
Designed for quieter operation compared to typical industrial blowers, reducing noise fatigue for workers in confined spaces and surrounding areas during extended ventilation operations.
Common Applications
Confined Space Ventilation
Designed specifically for ventilating large confined spaces such as manholes, vaults, tanks, tunnels, and vessels where hazardous gases or oxygen-deficient atmospheres may be present. Meets OSHA confined space ventilation requirements when used with appropriate ducting and safety protocols.
Hazardous Location Environments
Rated for use in Class I and Class II hazardous locations, making it appropriate for refineries, chemical plants, fuel storage areas, and other sites where flammable vapors or combustible dusts are a risk.
Construction Sites
Provides fresh air supply or exhaust ventilation in below-grade construction areas, utility tunnels, and enclosed structures where air quality must be maintained for worker safety.
Industrial and Manufacturing Facilities
Suitable for ventilating industrial equipment enclosures, processing areas, and manufacturing spaces where statically conductive environments or hazardous atmospheres require explosion-proof rated equipment.
Inline Booster Application
Can be deployed as a booster blower alongside other axial units to extend duct runs and maintain airflow velocity over longer distances, supporting complex multi-zone ventilation setups.
Shipyard and Refinery Work
The explosion-proof rating and chemical-resistant housing make this blower well-suited for shipyard confined spaces and refinery vessels where flammable gases and corrosive environments are common.
Compatible Materials
- Statically conductive ducting (Allegro brand recommended)
- Standard 12" diameter flexible ducting (non-EX applications)
- Explosion-proof socket/outlet (required, sold separately)
- Compatible with Allegro 12" inline booster blower (Order No. 9539-12EXI) for extended duct runs
Product Documents
Frequently Asked Questions
Q: Does this blower require a special outlet or socket?
A: Yes. The 9539-12EX includes a NEMA rated 115V plug but requires an explosion-proof socket for operation. The explosion-proof socket is sold separately and is mandatory for use in hazardous locations.
Q: What hazardous location classifications does this blower meet?
A: The 9539-12EX meets Class I, Divisions 1 and 2, Groups C and D and Class II, Divisions 1 and 2, Groups F and G hazardous location requirements. It is UL Recognized and CSA Certified to CSA Standard C22.2 No. 113.
Q: Can this blower be used for both supply and exhaust ventilation?
A: Yes. The 9539-12EX can ventilate (supply fresh air into a space) or exhaust (remove air from a space), providing operational flexibility and reducing the need for separate supply and exhaust units.
Q: What type of ducting should be used with this explosion-proof blower?
A: Allegro recommends pairing the 9539-12EX with Allegro statically conductive ducting to maintain the integrity of the explosion-proof system in hazardous environments.
Q: Can this blower be used as a booster blower?
A: Yes. The 9539-12EX can be used as a booster blower in-line with other axial blowers to extend duct distances and maintain adequate airflow in longer ventilation runs. A dedicated 12" Axial Explosion-Proof Inline Booster Plastic Blower (Order No. 9539-12EXI) is also available.
Q: What is the airflow output of the 9539-12EX?
A: The blower delivers 1,475 CFM free air, 1,300 CFM with one 90° bend, and 1,200 CFM with two 90° bends, based on testing with 15' x 12" ducting.