The installation of a bathroom extractor fan, just like any other installation, is guided by a set of regulations that you need to follow. It is extremely important to abide by the installation regulations if you want to achieve the best results in terms of service and satisfaction. Bathroom extractor fan installations are usually done either on the ceiling or walls of the bathroom and before you do it, you need to familiarize with the installation zones.This is because your installation is supposed to correspond with the regulations of each zone. These zones are usually numbered from zero to two with each representing a specific section in a bathroom or shower.
For a bathroom, this zone is the area that is in the inside of the bath. For a shower, on the other hand, this zone represents the area inside the shower’s basin. Sometimes you might find that the shower is missing a basin. In such a shower, zone 0 is the area 10cm above the finished floor and it includes the surrounding area of the fixed shower head up to 1.2m. As far as the installation regulations are concerned, it is prohibited to install the bathroom extractor fan in this zone.
This is the other zone in the bathroom which is the area covering the same area as zone zero except it extends to 2.25m above the level of the floor. For a shower, this zone covers the width of the shower basin and 2.25m from the floor. However, if the shower lacks a basin, this zone is the area 1.2m around the fixed shower head. It is worth noting that this zone does not include zone 0 even though it looks like its area overlaps that of zone 0. For an extractor fan to be installed in this zone, it needs to have 12v SELV motors fitted and SELV transformers together with isolators installed out of any of the zones.
How the Zones are Determined in a bathroom or shower?
As seen from the above text, it is clear that the zones are not just selected at random. There is a criteria that is used to determine the areas for each zone. What we know for sure is that the ceiling, floor and wall have a hand in the determination of these zones. To some extent, also the presence or lack of a basin in the shower determines the position of these zones. What this means is that the regulations for the installation of a bathroom extractor fan are dictated by these three structures.
A point to note is that for any bathroom extractor fan installation to be successful, all the circuits in bathrooms and showers need to have RCDs. Initially, it was a compulsory requirement to have a local supplementary bonding but this requirement has been relaxed provided you have met the rest of the requirements. Once you have satisfied the requirements as per the instructions, the rest of the installation process should be a walk in the park.