The Poly Ring Panels are engineered for light dust loading applications. They consist of 100% non-woven polyester. Two distinct plies of media shall be utilized, each being more dense than the one preceding it. The progressively dense fiber orientation of each media layer enables the small micron size particles to depth load within the filter. The Poly Ring Panels have a nominal thickness of 1/2″. An internal wire frame shall be thermally sealed within the filter. There shall be sufficient media overlap to ensure a positive seal between the filter and the holding frame, eliminating air bypass. They are packaged 12 per box.