Nicro Ventilation Solar-Powered MiniVent 1000 is small yet effective. With an improved design, the Solar MiniVent moves air at a rate of up to 7000 cubic feet per hour during the day with just a slight breeze. This is Nicros smallest diameter solar exhaust vent that also provides passive ventilation at night and helps fight mold, mildew and musty air. By running on solar power during the day and passive ventilation at night, the constant flow of air produced by these vents helps to keep boat interiors dry which extending the life of upholstery, electronics and metal components. Vents easily retrofit to existing cutouts up to 6” in diameter. Direct-to-deck mounting affords greater security and protection against theft while the 100% waterproof shut-off damper can be operated from below. Constructed from durable white ABS with infused UV inhibitors, these vents are long-lasting and fade resistant. Key Features Solar powered vents require little to no maintenance 100% shutoff from below helps prevent green water invasion No external power cords or batteries required Includes insect screen, plastic interior trim ring, and mounting hardware Vent attaches directly to deck Waterproof exterior Specifications Type: Solar and passive Dimensions: 7”dia. X 1 3/4”H Cutout Size: 3 3/4"dia. Warranty: Two years limited