The MSA 484089 Duo-Twin Constant Flow Airline Respirator is a yellow air-supplied respirator
that allows users to add particulate filters or chemical cartridges for multi-contaminant protection.
It is designed for use in adequately ventilated areas with at least 19.5% oxygen, ideal for applications
like asbestos abatement, chemical processing, and pharmaceutical work.
The "yellow" designation often refers to the color of the facepiece or headgear, though the product number itself is the key identifier.
Features and benefits
Fresh-air supply: Provides a constant flow of air from an external source, ideal for long periods of work.
Combo protection: Can be used with particulate filters and/or chemical cartridges for versatility against a range of contaminants.
Switchable exhalation valve: Allows for comfortable long-term use, which is particularly beneficial for abatement projects.
NIOSH approved: Meets standards set by the National Institute for Occupational Safety and Health.
Positive pressure: Designed to maintain a slight positive pressure inside the facepiece to help prevent inward leakage of contaminants.
Important considerations
Ventilation: Must be used in areas with at least 19.5% oxygen.
Fit: Proper fit is crucial; it may not provide a satisfactory seal for individuals with beards or other facial hair that prevents contact between the face and the sealing surface.
Accessories: Requires a proper air source and accessories to function correctly.
Maintenance: Filters or cartridges must be used in conjunction with the respirator to protect against specific contaminants.