BoAir Electrostatic permanent home furnace filters contain ViBax MI-50, an effective and safe anti-microbial agent that works to limit and control airborne bacteria, mold, mildew, germs and fungi as well as reduce odors. BoAir electrostatic furnace filters are built to last and are backed by a Lifetime Warranty (Ten Year Warranty for commercial applications). Their solid aluminum frame construction is available in many sizes to fit your furnace. Simply match your current furnace filter size to match the BoAir sizes. No electrical connections or modifications necessary!