The noise suppressor, an exhalation system, has to be placed between cpap mask and hose. It is suitable for use with all commercially available mask systems without an integrated exhalation system with an ISO cone.
The air flows quietly out through the micropores. This noise suppressor can be used with all non-vented nasal mask, e.g. JOYCE NV, JOYCE GEL NV, JOYCE NV 40 hPa, SOMNOmask).