Welcome to the Half Face Respirators category at Allens Industrial Products. Here, you'll find a comprehensive range of half face respiratory protection solutions designed to safeguard against contaminants.3M™ Secure Click™ Half Facepiece Reusable Respirator with Speaking Diaphragm Small - 3M Product Number HF801SD - 3M ID UU009621507 Medium - 3M Product Number HF802SD - 3M ID UU009622216 Large - 3M Product Number HF803SD - 3M ID UU009620970