adelias. Ceiling Fan. December 18th , 2017.
The rib vault came about in medieval times, where builders set up diagonal ribs first and then built the vaulted ceilings on these. And the fan vault is a fancy, filled-out version of the rib vault, in which the lower portion of the arch forms the smallest part of an open fan and the upper part extends outward like an open fan. (Check out Encyclopedia Britannica for more information on vaulted ceilings.)
On days that are cold (or hot, in summertime), the larger spaces created by vaulted ceilings require more energy to heat (or cool down). This decrease in energy efficiency can be considered a waste and unnecessarily expensive, because no one really “uses” that extra air up there.
If you only plan to use the ceiling during the summer, then you don't really have to worry about any restrictions. If, however, you plan to use it all year round, you need to get one with a reverse function. The bladed will rotate counter clockwise during summer to generate cold air and clockwise during winter to push the warm air downwards.
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