A pleated air filter is made of a sheet of polyester, paper, or cotton folded into pleats to increase the entire surface area. This makes the filter to trap more airborne particles such as dust, dirt, and hair (from pets and humans), which could otherwise damage your furnace's blower fan and clog the AC coils. Also, a pleated filter will improve the indoor air quality of your home.
The filter is designed to deliver consistent and reliable filtration performance even under extreme heat conditions, providing clean and purified air or gas.