The sizerepresents the diameter of the pipe from behind the fan. Now that you have an idea about how big the extractor fanshould be it is time to choose the right type for the room you are going toplace it in. When it comes to bathroom extractor fans, people are usuallyconnecting them at the light system. This helps by starting the fan the sametime you open the light in the bathroom, and stops it the same time you closethe light. However, this is not a good solution for the daytime, when you mightnot use artificial light; that is why you can choose to place an individualswitch for the extractor fan. Another good option for the bathroom or any other room whichpresents a higher level of humidity is the humidistat. 

It is basically anextractor fan featured with a humidity sensor, which will start when thecondensation inside the room reaches a predefined level, and stops when thelevel drops below the setting. The humidistat is a good alternative for roomswhere you canÂ’t install an extractor fan connected to the light system, as youare not always using the light inside that room.Temporized fans are a great addition especially for toilets,as the odor takes a bit more time to be extracted from the room. Temporizedfans will continue to work for a period of time after you send the shutdownsignal and leave the room. The time on which they will continue to work can beset between 2 and 25 minutes. Finally, you must consider the power that the extractor fanoffers. When it comes to extractor fans, the more powerful it is the better itwill do its job. The only disadvantage of a very powerful fan could be thenoise generated by the rotation. 

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