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Philips Respironics Ultra Fine Filters for Tranquility Quest, Quest Plus, Auto and BiLevel Machines - 5 Pack
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DIMENSIONS: Approximately 4.25 x 4.50 inches with a slightly curved rectangular shape.
USAGE: These filters are disposable; for optimal performance they should be changed regularly when they appear soiled or discolored. For complete instructions review the documentation that came with your equipment.