3M™ Secure Click™ Reusable Half Face Mask HF-800 Series is available as two versions, HF-800 and HF-800SD. The HF-800SD versions have a speaking diaphragm. Both versions are available in three sizes. 3M™ Secure Click™ HF 800 Series Half Mask Reusable Respirator helps protect against particulates and a wide variety of gases and vapours when used with approved 3M™ Secure Click™ cartridges and filters* Greater breathability and comfort provided by the world’s first quad flow cartridge system* Push button seal check helps bolster confidence that the respirator is properly sealed to the face* Speaking diaphragm is designed to help provide easier communication while you work* Confidence that filters and cartridges are installed properly provided by all new Secure Click™ connection* Low profile half mask design offers a wide field of view and compatibility with certain welding and grinding shields* Over-moulded design for easy assembly/disassembly* Advanced silicone material for increased comfort and greater durabilityEN 140:1998