331205 Sea-Dog Line Narrow Slotted Ventilator Vent 8 Louvers Stainless 132-1390 Sea Dog Stainless Steel Louvered 8 Slot Vent Exterior Length ( D ): 16 3/8" x Exterior Width ( C ): 2 7/8" Model # SD-331200 Material: 316 S.S. Recommended Fastener Size: #6 RH