[header] How to buy a ceiling fan [title] Measure the length and width of the room. [step] Before you go ahead and buy your new ceiling fan, there are a number of factors and variables that you need to take into account. The first of these is the size of the room you are buying the fan for. 
To make sure that the fan works effectively you need to ensure that it is big enough for the space. [substeps] Get hold of a tape measure and determine the length and width of the room.