Full Mask Supplied Air Respirator, Low Pressure

Allegro 9901 Full Mask Supplied Air Respirator – Continuous Flow, Low Pressure

The Allegro 9901 is a NIOSH-approved, continuous flow low-pressure supplied air respirator designed for demanding industrial environments including manufacturing, confined space entry, and painting operations. Constructed from hypoallergenic, chemical- and ozone-resistant silicone rubber, the full-face mask maintains its shape and seal integrity across extreme temperature ranges. A double sealing flange and deep chin pocket deliver an improved face-to-mask fit, while the high-impact polycarbonate lens with anti-fog and anti-scratch coatings ensures clear, distortion-free visibility throughout the work shift. One size fits most, making it a practical choice for contractors and trades professionals managing diverse crews.

Technical Specifications

Available Items

Unlike disposable or half-mask alternatives, the Allegro 9901 provides full-face protection with a replaceable polycarbonate lens and a silicone facepiece engineered to retain its shape under thermal stress — reducing replacement frequency and total cost of ownership. The integrated over-the-shoulder hose routing and adjustable belt clip keep the air supply line clear of the work area, a practical advantage in confined space and overhead applications where hose management directly affects worker safety and productivity.

Key Features & Benefits

NIOSH-Approved Supplied Air Protection

NIOSH approval confirms the respirator meets federal performance standards for supplied air equipment, giving contractors documented compliance for job site safety programs and regulatory inspections. This is essential for confined space entry and high-exposure painting or industrial environments.

Silicone Rubber Facepiece

The hypoallergenic silicone rubber construction resists chemical and ozone degradation, making it suitable for environments where latex or standard rubber masks would deteriorate. Silicone also holds its shape in extreme heat and cold, maintaining a reliable face seal across varying job site conditions.

Double Sealing Flange & Deep Chin Pocket

The double sealing flange creates an improved face-to-mask seal that reduces the risk of contaminant ingress around the perimeter. The deep chin pocket ensures a more comfortable, secure fit for a wider range of facial profiles.

High-Impact Polycarbonate Lens with Anti-Fog / Anti-Scratch Coating

The replaceable lens meets ANSI Z87.1 impact standards and features anti-fog and anti-scratch coatings that extend lens service life and maintain clear sightlines during physically demanding tasks. The wide, distortion-free field of vision reduces eye strain and improves situational awareness on the job site.

Over-the-Shoulder Hose Design with Adjustable Belt Clip

The unique over-the-shoulder hose routing clips at the collar and is secured by an adjustable belt, keeping the air supply line out of the worker's immediate work zone. This design reduces trip hazards and hose snagging, particularly important in confined space and manufacturing environments.

Removable Mesh Hairnet

The included removable hairnet improves comfort during extended wear and allows the mask to fit easily under a hard hat, supporting compatibility with other required PPE on regulated job sites.

Large Diameter Contoured Exhalation Valve

The large-diameter exhalation valve design reduces breathing resistance and heat buildup inside the mask, improving comfort during sustained use in hot or physically demanding conditions.

Non-Slip Five-Point Rubber Harness

The durable rubber five-point harness distributes mask pressure evenly across the head and resists slipping during movement, keeping the mask properly positioned without requiring constant readjustment.

Common Applications

Confined Space Entry

Supplied air respirators are required for many confined space operations where atmospheric hazards cannot be fully controlled; the 9901's NIOSH approval and OBAC quick-connect fittings make it well-suited for these high-risk entries.

Industrial Painting & Coating

Full-face supplied air protection is standard practice when spraying solvent-based coatings, epoxies, or other high-VOC materials; the wide polycarbonate lens also protects eyes from overspray.

Manufacturing Environments

In manufacturing settings with airborne particulates, chemical vapors, or process gases, the continuous flow design maintains positive pressure inside the mask to help prevent contaminant ingress.

General Industrial Operations

Suitable for a broad range of industrial tasks where supplied air respiratory protection is specified, including chemical handling, surface preparation, and other high-exposure work.

Compatible Materials

• Chemical vapors and gases (industrial environments)
• Airborne particulates (manufacturing, surface prep)
• Paint and coating overspray (solvent-based and other high-VOC coatings)
• Atmospheres encountered in confined space entry operations

Frequently Asked Questions

Q: What size is the Allegro 9901 full mask respirator?
A: The 9901 is one size fits most, designed to accommodate a wide range of facial profiles through its adjustable five-point harness and deep chin pocket design.

Q: Is the lens on the 9901 replaceable?
A: Yes. The polycarbonate lens is replaceable, and optional lens peel-off covers (PN 9901-25, sold in packs of 25) are available to extend lens life in high-contamination environments.

Q: What type of air connection does the 9901 use?
A: The 9901 comes equipped with OBAC quick connects for fast, secure connection to a supplied air source.

Q: Is the 9901 approved for confined space use?
A: The 9901 is NIOSH approved and listed for confined space applications, making it appropriate for use where regulatory requirements mandate supplied air respiratory protection.

Q: Can the 9901 be worn under a hard hat?
A: Yes. The removable mesh hairnet and the mask's profile are designed to fit easily under a hard hat, supporting compatibility with standard head protection requirements.