Size" L x H x W 17-9/16 x 2-3/4 x 11/16 Packaging Bulk Color White A clean, contemporary, louver designed vent. Corrosion-resistant ABS plastic. Install with #8 screws. For use with collector boxes 1341 for 3" system or 1342 for 4" system. Sized for installation even on highly contoured decks. Installation hole size 2 x 15-3/8.