A low cost, high volume passive exhaust vent. Only 7" in diameter, yet will move 600-1,000 cubic feet of air per hour in a 15 knot breeze. Translucent center panel allows light to pass through it. Fits a 3 3/4" installation hole. Center damper shuts vent off from below. Includes a 3" white air vent. Size 7" x 1 3/4"