During summer is best for your ceiling fan should be pushing the air downward (spinning counter-clockwise). However during the winter time you can get more of the hot air inside your house by reversing it (spinning clockwise).
First thing to do is to check that everything is tight. Check the blades, blade arms/blade irons, check that the motor is well secure, the downrod well placed, and the mounting bracket. Finally make sure being very careful that the electrical box and/or beam from which the ceiling fan is hanging from is secure.
Usually the humming/buzzing sound means that the ceiling fan is still receiving power but it's not transmitting that power through to make the ceiling fan spin, which usually are either of two scenarios:
1) If you have a ceiling fan that has pullchain, and are using a remote control, in-wall remote, in-wall switch, or any other wireless device to control the speed of your fan, it is very possible that the speeds may be mismatched. To fix this make sure to set press/set the speed on the remote you are using to high. Then go to your ceiling fan try pulling the chain and see if the highest velocity is matching to the setting you are on. Once you get to that point go back to your remote and test all other velocities. After that the humming/buzzing should be gone.
2) A bad capacitor. These pieces are sometimes vulnerable to power surges and they can go bad over time. You can purchase one of these capacitors from any of our models or if you are looking from another brand that is not ours you can always give us a call an see if we can provide you with one that will fit your current fan.
The truth is that it depends. The standard is usually 5 though going with 4,3,2, and even one may give you the same amount of CFMs. One of the most deciding factors when it comes to ceiling fan efficiency is the shape of the blade and the ceiling fan motor. Air comes out of the end third of the blade, so if you have leaf-shaped blades the tip of the blade will have less area to push air down, while the standard looking blades will have a more area thus pushing more air.
Don't be discourage though of going with decorative blades, every set up is different. As some of our customers tell us, they don't need a helicopter in their ceiling.
A very important thing when you buy blade arms/blade irons or blades, is that they should come in balanced sets. This will prevent your fan to wobble and keep and even breeze after you replace them. Another key aspect of this is the hole pattern.
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