4 blades, 1/2" bore x 14" diameter Includes Set Screw (Allen Head) Material = Sheet Metal Replaces 99020132, 99020133, 99020154 Fan Blade for Attic Vent Motor Suggested replacement reference for: 341, 342, 340, 343, 344, 345, 346, 347, 348, 349, 350, 353, 35316, 355, 356, 358