Turbine vent. 17 1/2 in. x 17 3/4 in. x 8 in. Cap to be used as a turbine replacement for 12-in. or 14-in. noisy turbines. No spinning and squeaking. Rounded shape harnesses the wind and uses it to draw air from the attic with the venturi effect. Injection moulded with a high grade virgin polyprpylene material. UV protected. Made in Canada. CSA and Dade County approved. Black.