Gas treatment devices

摘要

A combined filter and HME has a rectangular housing 1 with an inlet port 5 and an outlet port 14. A pleated filter element 20 is located in the housing towards the outlet port 14 and an HME element 21 is located towards the inlet port 5. An oval deflector 10 between the HME element 21 and the inlet port 5 is oriented with its longer axis aligned with the shorter lateral dimension of the housing 1, so that gas from the inlet is deflected preferentially along the longer lateral dimension of the housing, thereby giving a more evenly distributed gas flow over the surface of the HME element.