Dayton 20 inch propellers are fan blades that are designed to circulate and exhaust air in ventilation applications. They rotate in clockwise direction and feature 3 blades made from aluminium for lightweight yet durable construction. They also include set screws for easy installation. Choose from a wide range of these 12-inch propellers, available in 10, 17, 20, 23 and 24 degrees pitch variants on Raptor Supplies.