Vector Louvered Vents The Vector vent is sized to fit most applications and may be ganged end-to-end for larger boat installations. Molded of tough ABS , these vents will not corrode or discolor. They are designed to accommodate the capacity of either two 3" hoses or two 4" hoses for intake or exhaust. Outside Dimensions: 2 " wide x 18 " long x 11/16" flush height. Cutout Dimensions: 1-15/16" x 15-3/8". Fits 7-2-24 or 7-2-26 Collector Boxes.