Perkos Louver Ventilators allow proper ventilation in enclosed spaces. Built with 304 stainless steel, these vents are durable and attractive solutions for your boat; keeping unwanted elements out while allowing air to pass through. Whether needed in the cabin, engine room, or any other enclosed space, louvered vents help keep air flowing through to eliminate musty air and mildew. These inexpensive and compact vents add a touch a style and come drilled for #4 RH or PH screws. Specifications Type: Louvered Material: 304 stainless steel Dimensions: 3” x 3” Warranty: Five years