That depends on which way you want the air to go.
Replacement fan blades can be bought from a number of stores. Retail stores including Home Depot and Lowes sell fan blades. Online Amazon and the auction site eBay have a range of both new and used replacement fan blades.
The fan blades are turned by an electrical motor.
A twin window fan is considered to have two fan blades. Holmes is one of many manufacturers of such a fan. In reality, a window fan will have at least three blades per fan unit with a twin fan have 6 blades total.
A typical ceiling fan has 3 to 5 blades.
Generally, the blades of a fan spin in a counter-clockwise rotation (when facing the fan), so that the air is pushed downward if its a ceiling fan, or toward you if its a standing fan.
One thing that happens is the fan blades on the transmission get bent up into the drive belt and the fan blades throws the belt. The right way to fix is is to replace the fan, but you can bend the fan blades down by hand without removing anything and it seems to work just as well.
The fan blades.
This can vary depending on the fan its self and what way the blades face.
a fan moves air with fan blades.
nothing a fan with three blades is just weaker and smaller than a fan with four blades! <3
it will make fan heavy and thus consume more power as compare to 3 blades fan
you have to go on the fan blades of the mill and spin them counter clockwise