Not all masks are created equal.** When dealing with hoof smoke or surgical plumes, the ability of a mask to filter harmful particles is critical. **Particle Size in Smoke:** - Surgical smoke particles: **0.01 – 1 µm**, most **<0.3 µm** - Hoof smoke likely includes **ultrafine particles** from burning keratin and metals, estimated in similar size ranges **Mask Comparison:** 1. **Surgical Mask:** • Designed to block **large droplets** >5 µm • Not tight-fitting – allows air (and smoke) to enter from the sides • **Not effective** against ultrafine particles 2. **FFP3 Respirator (or N99):** • Filters at least **99% of particles down to 0.3 µm** • **Tight-fitting** with proper seal to prevent air leakage • Designed for **high-risk aerosol environments** like smoke, chemical vapors, and surgical contamination **Conclusion:** - Surgical masks **do not** protect farriers or surgical staff from smoke inhalation - **FFP3 respirators are essential** when working around hoof smoke, hot shoeing, or surgical cautery devices 🛡️ *Always use an FFP3-rated respirator when exposed to visible smoke, aerosolised particles, or chemical vapours.*1e:T46d,