The SDI Diagnostics PulmoGuard MG™ PFT Filters are high-efficiency, single-use barrier components engineered to capture aerosol contaminants during pulmonary function testing (PFT). Designed specifically by SDI Diagnostics for clinical infection control, the PulmoGuard MG™ series features a custom structural profile tailored to fit MGC Diagnostics (formerly MedGraphics) spirometers natively without requiring separate plastic adapter rings.