On Amazon.com you can now buy this 室内空气循环风扇
Vornado 660 Whole Room Air Circulator Fan for just $69.99 shipped (regularly $99.99) – lowest price ever!

This whole room air circulator features vortex action which moves air up to 100 feet. The chrome glide bar on the back enables a full 90-degree tilt, and you can choose from four speed settings. The detachable grill lets you dust the blades easily. Plus, it’s backed by Vornado’s industry-leading 5-year satisfaction guarantee.