Allegro 12" Axial AC Plastic Blower — High-Output Confined Space Ventilation
The Allegro 12" Axial AC Plastic Blower (Item #9543) is a 1 HP, 115V–230V AC ventilation blower engineered for high-airflow applications in construction, industrial, manufacturing, and confined space environments. Built from lightweight, corrosion-, UV-, and chemical-resistant polyethylene, this unit delivers up to 1,842 CFM of free-air output while remaining compact enough for easy transport and storage. It is designed for use as a blower only or as part of a complete system with optional ducting and storage canister. The unit is certified to CSA Standard C22.2 No. 113, UL Recognized, and CE Certified, making it compliant for use across North American and international job sites.
Technical Specifications
| Specification | Details |
|---|---|
| Brand | ALLEGRO |
| Item # | 9543 |
| UPC | 741851954301 |
| Power | 1 HP |
| Voltage | 115V–230V AC, 50/60 Hz |
| Airflow — Free Air | 1,842 CFM |
| Airflow — One 90° Bend | 1,004 CFM |
| Airflow — Two 90° Bends | 933 CFM |
| Housing Material | Polyethylene |
| Color | Safety Orange |
| Weight (Blower Only) | 28 lbs. |
| Shipping Weight | 30 lbs. |
| Country of Origin | China |
| Applications | Construction, Industrial, Manufacturing, Confined Space |
| Certifications | UL Recognized, CSA Certified (C22.2 No. 113), CE Certified |
| Technical Tips | Pair with Allegro standard ducting |
Available Items
| Item # | Description | Configuration |
|---|---|---|
| 9543 | 12" Axial AC Plastic Blower | Blower only — 28 lbs. |
| 9543-E | 12" Axial AC Plastic Blower (220V AC/50 Hz) | Blower only (220V AC/50 Hz). Does NOT meet CSA C22.2 No. 113 requirements. |
| 9543-15 | 12" Axial AC Plastic Blower with canister and 15' ducting | Complete system — 43 lbs. |
| 9543-15E | 12" Axial AC Plastic Blower with canister and 15' ducting (220V) | Complete system (220V AC/50 Hz) |
| 9543-25 | 12" Axial AC Plastic Blower with canister and 25' ducting | Complete system — 49 lbs. |
| 9543-25E | 12" Axial AC Plastic Blower with canister and 25' ducting (220V) | Complete system (220V AC/50 Hz) |
| 9520-43M | 12" Axial AC Plastic Blower System with 12" MVP | Complete blower system with MVP |
Compared to metal axial blowers of similar diameter, the polyethylene housing significantly reduces unit weight and eliminates corrosion concerns in wet or chemically active environments. Unlike centrifugal blowers, the axial design prioritizes high CFM at lower pressure, making it the preferred choice for shorter duct runs and smaller confined spaces where portability and cost efficiency are primary considerations. The availability of both 115V and 220V/50 Hz configurations also extends its usability to international job sites.
Key Features & Benefits
High-Output 1 HP Motor
Delivering up to 1,842 CFM of free-air flow, this blower moves substantial air volume for effective ventilation of confined spaces. The 1 HP motor maintains meaningful airflow even through ducted configurations — 1,004 CFM through one 90° bend and 933 CFM through two 90° bends — ensuring adequate ventilation even in complex entry configurations.
Lightweight Polyethylene Housing
The polyethylene canister and housing assembly weighs just 28 lbs., making it easy for a single worker to transport to and from the job site. The material is inherently resistant to corrosion, UV degradation, and chemical exposure, extending service life in harsh field conditions.
Molded-In Carry Handle
A carry handle is molded directly into the housing, eliminating the risk of a separate handle detaching during transport. This design detail improves one-handed portability and reduces setup time on site.
Bottom Enclosure for Electrical Component Protection
A bottom enclosure shields the motor and electrical components from debris, moisture, and incidental contact. This protection helps maintain reliable operation and extends the service life of the unit in demanding job site conditions.
Super Quiet Operation
The axial design operates at reduced noise levels compared to many alternatives, reducing worker fatigue and improving communication on site during extended ventilation operations.
Safety Orange Color for High Visibility
The "safety orange" finish makes the blower easy to spot in busy work environments, reducing the risk of trip hazards and helping crews quickly locate equipment on cluttered job sites.
Dual-Mode Operation — Ventilate or Exhaust
The unit can be configured to either supply fresh air into a confined space or exhaust contaminated air out of it, giving crews flexibility to adapt to the specific ventilation requirements of each job.
US and International Wiring Configurations Available
Available in standard 115V–230V AC/50–60 Hz (9543) and 220V AC/50 Hz international wiring (9543-E), allowing deployment on domestic and international projects. Note: the 220V/50 Hz version does not meet CSA C22.2 No. 113 requirements.
Stackable and Storage-Ready
The blower is designed to be stackable for ease of storage, and optional canister configurations (15' or 25' ducting included) allow the complete system to be stored and transported as a single unit.
Common Applications
Confined Space Entry Ventilation
Supplies or exhausts air in manholes, vaults, tanks, tunnels, and other confined spaces prior to and during worker entry, supporting OSHA confined space entry requirements.
Construction Site Ventilation
Moves fresh air into enclosed construction areas such as below-grade structures, utility corridors, and partially enclosed buildings where natural airflow is insufficient.
Industrial and Manufacturing Facilities
Ventilates hoppers, silos, storage bins, pipelines, and vessels in industrial and manufacturing settings where air quality must be maintained during maintenance or inspection operations.
Short-Distance Ducted Runs
Best suited for shorter duct distances with minimal bends, making it ideal for manholes, small tanks, and similar confined spaces where duct runs are straightforward.
Portable Job Site Use
The lightweight construction and molded carry handle make this blower well-suited for contractors who need to move ventilation equipment frequently between work areas or job sites.
Compatible Materials
- Allegro standard ducting (15' and 25' options available)
- Compatible with Allegro 12" MVP (Multi-Vent Plenum) systems (Order No. 9520-43M)
- Designed for use with standard axial inline booster blowers as a velocity accelerator for longer duct distances
Product Documents
Frequently Asked Questions
Q: What is the airflow output of the 12" Axial AC Plastic Blower?
A: The blower delivers 1,842 CFM in free air, 1,004 CFM through one 90° bend, and 933 CFM through two 90° bends.
Q: Is this blower available with ducting and a storage canister?
A: Yes. It is available as a blower only (9543), or as a complete system with a canister and 15' of ducting (9543-15, 43 lbs.) or 25' of ducting (9543-25, 49 lbs.).
Q: Is an international voltage version available?
A: Yes. The 9543-E is wired for 220V AC/50 Hz for international use. Note that the 220V version does not meet CSA C22.2 No. 113 requirements.
Q: Can this blower be used to exhaust air as well as supply it?
A: Yes. The unit can ventilate (supply fresh air) or exhaust (remove contaminated air) depending on how it is positioned at the confined space opening.
Q: What certifications does this blower carry?
A: The 9543 is UL Recognized, CSA Certified to C22.2 No. 113 (Fans and Ventilators), and CE Certified. The 220V/50 Hz version (9543-E) is CE Certified but does not meet CSA C22.2 No. 113.
Q: When should I choose an axial blower over a centrifugal blower?
A: Axial blowers are best when portability and cost are major factors, when working in smaller confined spaces, and when duct runs are short with minimal bends. Centrifugal blowers are better suited for longer duct distances and configurations with multiple 90° bends.