These Outsource cold air returns are made with Platinum MDF. They come with frames or without frames, primed, and come in three different lengths. In addition to these options, they come with a 30-degree grate for more of a low profile. These cold air returns stand out from the baseboards, eliminating the need for beveling baseboard ends. This quality primed coat is easy to paint, giving you the option to match it with the wall colour. The minimal design blends right in, fitting any home without standing out any more than a soft gentle breeze. These are a must-have air vent for your home!