1. AIR. These filters actively clean the air as it leaves the CPAP or BiPAP machine, working in conjunction with the machines built in filters, to provide exceptionally throughout the night and helps to protect against viruses and . 2. FOR ALLERGY SUFFERERS. Our Cpap / Bipap filters are a for sleep therapy users who are prone to sickness or allergies. 3.KEEPS AIR FLOW STRONG. Low resistance to gas flow means that the user keeps the strong airflow that come from the CPAP/BIPAP machine. 4.SIMPLE TO INSTALL. Bacterial Filter For CPAP/BIPAP Machines is quick and simple to install and replace - Simply attach the filter to your machine between the air outlet and your standard CPAP tubing. 5.DISPOSABLE FILTERS. Our Filters will last on average 4-6 weeks before needing to be replaced, however your filters may last for a longer or shorter amount of time depending on environmental conditions. They should be replaced whenever the white filter material begins to look dirty. Name:CPAP Filter Type: CPAP Filter Work Mode: CPAP Model Number: CPAP Bacterial Viral Filter M1 Pressure Range: 4-30 cmH2O Product: CPAP Bacterial Viral Filter Function: Filter Viral and Airborne Filtration Efficiency: 99.99% Feature: High quality; Easy to use Compatible with: CPAP, APAP, BPAP Machines size: Machine connection inner diameter: 13mm length: 25mm Hose connection inner diameter: 15mm length: 22mm Material:plastic colour:Light green Package Contents: 5 * CPAP Filter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.