You can call by phone Lasko customer Service and Replacement Parts......1-800-233-0268.......givi them FAN info and they will ship you part..........................Also check, your product may be covered under WARRENTY or may be listed under product recall .......either will reduce your COST .....
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THose usually just pull off. You will have to pull hard because there is a spring clamp that they sometimes put around the inside hub of the fan. If there is a clamp, you will need to transfer that to the new blade. Hope this helps!
Joey Temal is right. After removing any small metal retaining clips (which are obvious and easily removed), you have to pull down ridiculously hard to get the fan blade off. Alternate short jerky pulls with steady downward traction.
I can tell you how to take the fan blades off your Lasko Model 3723 fan, but you might not be able to use it on your other fan. The reason why is that the motors, although similar, may not have the same diameter shaft.
Of course, you should have the power cord unplugged from the AC outlet before removing the front fan grille and placing your hands on the blades. Safety first!
The fan blades and hub are a single unit that stretches to fit onto the motor shaft. There is no setscrew at all. Take any sort of metal bar or tool such as a screwdriver or pry bar and carefully lever the hub off the shaft by pressing your lever to lift the hub a small fraction of an inch on each side, working the hub slowly upwards against the long vertical bars that support the motor. If you have reasonably strong hands, you may be able to pull the hub toward you by placing your fingertips under the edge of the hub and pressing with your thumbs against the vertical support bars as needed. It's not too difficult to do.