The DURASeal XCEL Panel has a moisture resistant, durable plastic frame, making it self-supporting. The outer media trim self seals to the filter track. It has low airflow resistance and high dust holding capacity. The DURASeal XCEL Panel is 100% recyclable and incinerable with no metal parts. It is very efficient and comes in a non-woven polyester media. They come 24 to a box, providing very user-friendly storage (less handling & space requirement), and are extremely easy to install.