The SR 900 half mask is made of thermoplastic elastomer (TPE) and polypropylene (PP) in three sizes, S, M and L. The mask is equipped with two exhalation valves, which ensures very low exhalation resistance. The valve covers with partitions effectively protect the exhalation membrane against dust and paint mist. The material and pigment of the mask body are approved by FDA for foods, which minimizes the risk of contact allergies. The easily adjustable elastic head harness straps of the mask are designed as a V-shaped loop and have a large dished crown plate, which contributes towards a comfortable and safe fit. The half mask SR 900 is used in combination with: • Filters from the Sundström range. • Remote filter holder SR 905 according EN 12083. • The SR 307 or SR 507 compressed air attachmnet which then serves as a breathing apparatus with continuous flow for connection to a compressed air supply according EN 14594:2005. • The fan unit SR 500/SR 700 and approved filters included in the Sundström fanassisted respiratory protective device system conforming to EN 12942:1998. A pre-filter holder is supplied. Best stored in box SR 230 or storage case SR 339.