Stainless Steel Baffle:  These are the most common grease removal devices used in commercial cooking facilities today.  If they are installed correctly, they are completely up to code.  Correct installation of baffle filters is with no spaces or gaps between the filters, the baffles are running vertically, and the filters are set at the proper angle (no less than 45 degrees from horizontal).  Baffle filters are designed to allow much of the grease to run down the filter into the drip tray(s).