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 against viruses and . MUST HAVE FOR ALLERGY SUFFERERS - Our Cpap / Bipap filters are a for sleep therapy users who are prone to sickness or allergies. KEEPS AIR FLOW STRONG - Low resistance to gas flow means that the user keeps the strong airflow that come from the CPAP/BIPAP machine. 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. DISPOSABLE FILTERS - Our Filters 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. Type: CPAP Filter Item Type: Sleep & Snoring Pressure Range: 4-30 cmH2O Work Mode: CPAP Model Number: CPAP Bacterial Viral Filter Product: CPAP Bacterial Viral Filter Function: Filter Viral and Airborne Filtration Efficiency: 99.99% Compatible with: CPAP, APAP, BPAP Machines colour:milky Material:plastic size:10 x 10cm Package Contents: 4 x Filter Only the above package content, other products are not included. Note: Light reflection 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.