Solatron 8.5" Stainless Steel Solar Vent w/o Battery, for Boat, Shed, RV and More Moves 678 cubic feet of air per hour. Prevent mold, condensation, mildew, musty odors, damp, etc. Ideal for boats, green houses, RVs, trucks, lories, vans, offices, kitchens/bathrooms, and more! Overall Diameter: 8.5"; Mounting Hole Diameter: 4.5". Vent Height: 1-3/8 Model: Stainless Steel Solar Vent w/o Battery (SVT-215S)