●Non-solar ventilation option that allows air to pass through 600 to 1,000 cubic feet per hour with 15 Knots Breathe" ●Compact Size: 7" Diameter x 1-3/4" Height ●Center panels are translucent plastic to allow light to pass through under deck. Center damper shuts out the vents from below ●Strong UV Rays Stable white ABS construction ●"EASY TO INSTALL - Mounts directly to your deck with a compact 3 3/4" diameter hole. Reinstalls over existing holes up to 6" in diameter. "