Marinco 500 is a low cost, high volume passive exhaust vent.
Only 7" in diameter, yet will move 600-1000 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.
Size: 7" x 1-3/4"