ENGINEERING SPECIFICATION: ZURN Z899-THR Zurn Z899-THR threshold drain, stainless steel channel made of #12 gauge fabricated stainless steel conforming to ASTM A-240 (type 304) with outlet, anchor straps, and bead blasted finish. Threshold drain is engineered to enhance flow through the system through use of flow directing ribbing structure. Standard grate to be stainless steel wire grate (-SWG) conforming to ASTM A-240 (type 304), with vandal proof grate lock downs, meets ADA and heel-proof requirements, and is listed as Class A per DIN EN1433 load classification, in addition to being tested to 2500 lbs per ASME A112.6.3. Optional fabricated stainless steel grate (-FS) available, conforming to ASTM A-240 (type 304), with vandal proof grate lock downs, meets ADA and heel-proof requirements, and is listed as Class A per DIN EN1433 load classification, in addition to being tested to 2500 lbs per ASME A112.6.3