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. Available in three sizes, our respirators come with an optional speaking diaphragm to help provide easier communication while you work. Breathability: Greater breathability and comfort provided by the world’s first quad flow cartridge system. Two dual flow cartridges on each respirator combine to create four airflow paths for easier breathing. Simplicity: The new 3M™ Secure Click™ Series features a quick, simple cartridge/filter connection.