A-750 Breathing Air Pump

Allegro A-750 Breathing Air Pump — Portable Low-Pressure Air Source for Respirator and Hood Users

The Allegro A-750 Breathing Air Pump is a compact, oil-less rotary vane pump designed to deliver breathable air to one or two respirator users or a single hood user in demanding work environments. Built for contractors and trades professionals in manufacturing, painting, utilities, and industrial settings, it is particularly well-suited for use in painting or refinishing booths where a reliable, portable air source is essential. The unit ships complete with all necessary components for immediate deployment, including inlet and exhaust filters, pressure gauge, pressure relief valve, couplings, and rubber feet. Its rigid metal base and housing, combined with brass and galvanized steel plumbing, provide the durability required for repeated use across job sites.

Technical Specifications

Available Items

Unlike compressed-air systems that require a large compressor or external air supply, the A-750 is a self-contained, portable unit that can be positioned wherever breathable air is accessible, making it practical for confined or remote work areas. Its oil-less rotary vane design eliminates the risk of oil contamination in the delivered air stream, and the adjustable brass pressure relief valve provides on-site pressure management without additional tooling. US and international wiring configurations are available, extending its usability across different facility and job site power standards.

Key Features & Benefits

Oil-Less Rotary Vane Motor

The oil-less design eliminates the possibility of oil carryover into the breathing air supply, a critical consideration when the pump is used for respiratory protection. This also reduces maintenance requirements by removing the need for oil changes or oil-level monitoring during operation.

Portable and Lightweight Construction

The A-750 is designed to be moved between work areas, allowing contractors to bring a breathable air source directly to the task rather than routing long air lines from a fixed supply. Rubber feet keep the unit stable on flat surfaces without permanent mounting.

Rigid Metal Base & Housing with Brass and Galvanized Steel Plumbing

Heavy-duty construction materials resist the physical demands of industrial and construction environments. Brass and galvanized steel plumbing components resist corrosion and maintain integrity under repeated pressure cycling.

Quick-Connect Rectus (OBAC) Air Fitting

The industry-standard Rectus OBAC quick-connect fitting allows fast, tool-free connection and disconnection of respirator hoses, reducing downtime when workers need to move or swap equipment.

Adjustable Brass Pressure Relief Valve

The on-board adjustable pressure relief valve allows the operator to set and maintain safe delivery pressure at the point of use, providing a direct means of pressure management without additional regulators.

Complete Ready-to-Use Package

The pump ships with inlet filter, exhaust filter, pressure gauge, pressure relief valve, couplings, and rubber feet, so contractors can put the unit into service immediately without sourcing additional components.

UL Recognized

UL Recognition provides assurance that the unit has been evaluated to applicable safety standards, supporting compliance requirements on regulated job sites and in industrial facilities.

US and International Wiring Configurations

Availability in both 115/230V AC (50/60 Hz) and 220V AC/50 Hz configurations means the pump can be deployed in domestic and international work environments without rewiring or adapters.

Common Applications

Painting and Refinishing Booths

The A-750 is specifically noted as well-suited for painting or refinishing booth environments, where workers require a continuous supply of breathable air while working in atmospheres contaminated by paint fumes and solvents.

Manufacturing Facilities

In manufacturing settings where ambient air quality may be compromised by process emissions, the pump provides a dedicated breathable air source for one or two respirator users at a workstation.

Utilities Work

Utility contractors working in confined or restricted-access areas can use the portable A-750 to supply breathable air where fixed compressed-air infrastructure is unavailable.

Industrial Maintenance and Operations

General industrial applications requiring supplied-air respirators or hoods benefit from the pump's compact footprint and self-contained design, enabling deployment in areas where larger equipment cannot be positioned.

Compatible Materials

• Breathable ambient air (pump must be positioned where breathable air can be assured at all times)
• Compatible with supplied-air respirators (up to 2 simultaneous users)
• Compatible with single supplied-air hood systems
• Quick-connect Rectus (OBAC) compatible respirator hoses and fittings

Frequently Asked Questions

Q: How many users can the A-750 support simultaneously?
A: The A-750 supports a maximum of two respirator connections or a single hood user at one time.

Q: Can the A-750 be used with a generator?
A: No. Breathing air pumps, including the A-750, must not be used with generators. This is a stated safety warning from the manufacturer.

Q: Where should the air inlet be positioned?
A: The air inlet to the pump must always be located in an area where breathable air can be assured. The pump does not purify or filter contaminated ambient air — it must draw from a clean air source.

Q: Is the pump available for international voltage requirements?
A: Yes. The standard model (Item # 9821) operates at 115/230V AC, and an international model (Item # 9821-E) is available for 220V AC/50 Hz applications.

Q: Does the A-750 require oil maintenance?
A: No. The A-750 uses an oil-less rotary vane motor, eliminating the need for oil changes or oil-level monitoring.

Q: What is the maximum operating pressure?
A: The maximum output pressure is 15 PSI, managed by the included adjustable brass pressure relief valve.