16 1/4 x 21 1/2 AC filter/Furnace filter with (1) BioSponge Plus Replacement$$Tools & Hardware Other

Enhanced Air Quality – The treated polyester BioSponge Plus media effectively captures airborne particles, contributing to cleaner indoor air. Reusable Frame with Disposable Media – Features a durable, reusable frame paired with BioSponge Plus disposable filter media for easy maintenance. No air bypass - 100% Air Filtration (MERV 8) Simple to use, easily fits all makes and models of furnaces and air conditioners -- any size available Cost-Effective Solution – Reusable frame design reduces waste and replacement costs over time, offering long-term savings.