The SDI Diagnostics PulmoGuard Filter Kits with Comfit Mouthpiece are high-efficiency, single-use respiratory safety packages engineered to streamline clinical patient setup during pulmonary function testing (PFT). Designed by SDI Diagnostics, this configuration pre-bundles a premium electrostatic barrier filter together with an ergonomically contoured, rubberized-style Comfit disposable mouthpiece inside a single hygienic wrapper. This design provides superior patient comfort and lip-sealing compared to traditional cardboard tubes, minimizing air leakage and maximizing expiratory measurement accuracy.