Quality and Quantity : Our pack of 20 for heat moisture exchange filters ensures top- performance. Each filter, with a 25mm/22mm diameter, is individually sealed to prevent air contact, maintaining freshness and effectiveness for devices like Z1, Z2, and for . Easy Installation: Designed for hassle-free setup, each filter allows you to connect the larger diameter end to the mask and the smaller end to the tube. Ensuring a tight fit enhances performance and user experience, making it a breeze to maintain your system. Recommended Weekly Replacement: To keep your ventilation system at performance, replace our humidification solution filter weekly. This routine maintenance helps sustain efficiency and ensures continuous protection and comfort for users. Enhanced Safety and Comfort: The for filter material supports normal mucociliary transport functions, reducing airway resistance. This design offers maximum safety and comfort, reassuring both patients and healthcare professionals of its reliability. Color: As Shown Material: plastic Package Contents: 20 * Hot water exchanger filter kit 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.