The 12x24x4 filters on our site improve air quality and reduce energy consumption. When air comes through our 12x24x4 filters, the media catches contaminants, like dust, and stops them from entering the air supply. We have various designed 12x24x4 filters, such as the pleated V-shaped design that maximizes efficiency. The pleated V-shape minimizes resistance and keeps things consistent. The right pleat spacing ensures high performance and low resistance. What’s more, most of our 12x24x4 filters have medias that are bounded on using a moisture-resistance adhesive. The adhesive stops dirty air bypass and keeps things consistent. We also have heavy-duty 12x24x4 air filters that catch the smallest particles and have maximum DHC. As always, there’s free shipping on all orders.