Code
Description
Inline Ceiling Fans
Also known as duct fans, inline ceiling fans are mains voltage extractor fans which sit in the middle of a length of ducting up in the ceiling cavity, rather than on the wall. One end of the duct goes to a grille in the ceiling of the room, the other to the outside grille. If you look at the pictures above you will notice that both ends of the fans are circular to fit the ducting.
Since only the grille is visible with the motor is safely installed some distance away from the extraction point in the ceiling cavity, an inline ceiling fan may be used to extract air from any zone in the bathroom where a normal mains voltage fan may not be used.
Inline ceiling fans are powerful, and with correct installation can be quieter than normal fans, simply by virtue of the fact that the fan is up in the ceiling cavity rather than in the room. Inline ceiling fans may be cleverly combined to provide double the pressure when fitted in series, or double the extraction rate when fitted in parallel. Another common use for two inline ceiling fans is in houses with ensuite bathrooms, when two fans are used with a Y splitter an extract to the outside soffit using the same ducting. this is far neater and easier than using two wall fans!
