The Pentek PO1HE2 bag filters are rated to 1 micron (nominal). The Pentek PO1HE2 bag filter has a stainless steel ring sewn in at the top of the filter bag. The filter bag also comes with a handle for fast, easy bag filter changes. The PO1HE2 filter bag is made of FDA-compliant materials. The PO1HE2 high efficiency filter bags have a composite construction of microfiber, felt, and spun-bonded materials to hold 3 to 4 times more dirt than standard bags. The Pentek PO1HE2 Polypropylene Felt Filter Bags are a Size #2 which means they are 7-1/16 inches in diameter and 32 inches in length. The bag filter area is 4.4 square feet. Pentek PO1HE2 Polypropylene High Efficiency bag filters are compatible with a broad range of corrosive fluids including organic solvents, oils, acids, alkalis, microorganisms, and oxidizing agents. The Pentek PO1HE2 Polypropylene High Efficiency Filter Bags can withstand temperatures up to 200and#194;and#176;F. There is an initial pressure drop of less than 0.8 psi for the maximum rated flow at 68 degrees Fahrenheit. Differential pressure of 15 psi indicates the filter bag needs to be changed.