Important Installation Tips for Bathroom Extractor Fans

If looking for a way of preventing mold and mildew while ventilating the bathroom, an excellent solution is with a fan. However, for this you want to focus on bathroom extractor fans, which are designed specifically for this purpose. However, these fans are also made to stop the buildup of condensation, remove heat from the room, and create healthier air quality.

When hiring a professional for installation, details pertaining to regulations, zones, permits, wiring, voltage, and more would be covered. However, if you were to consider a number of fan kits, you could handle installation on your own although it would still be imperative to learn the details. That way, the fan would be installed properly to function effectively and efficiently, but more important, safely. The following are just a few examples of requirements for installation.

Wiring Regulations

Because these fans are designed for the bathroom, tight regulations must be followed to ensure safety due to the presence of water, humidity, steam, and condensation. Bathrooms are broken down into four zones, labeled as Zone 0, 1, 2, and 3. Zone 0 is the bath. Zone 1 extends vertically 7.4 feet above the bath, Zone 2 extends in all directions for 1.97 feet from Zone 1, and Zone 3 extends laterally 7.87 feet from Zone 2. For installation of an extractor fan, it must be within the appropriate zone.


Regardless of features such as ventilation timers, low energy, or humidistats, voltage plays a huge role as to the proper zone where the fan would be installed. This information provides insight into the process, as well as importance. For instance, these fans are sold as Mains voltage, which is 240v and Safety Extra Low Voltage (SELV), which is 12v.

Mains are only installed in Zone 3 whereas Safety Extra Low Voltage is designed for Zones 1 and 2 with a transformer being housed in Zone 3. Now, there is one exception in that if an Airflow QuietAir fan were being installed, Mains are designed specifically with an IP45 rating, which is used in Zone 3.

In addition, Inline fans are housed in a loft or ceiling space between two lengths of ductwork. In this case, impellers, motor, and electrical parts would not go in the zonal area. Instead, just the grille and duct within the ceiling of the bathroom would be used in Zone 1 and Zone 2, installed in the area above the shower or bathtub. By following Zone and voltage requirements, bathroom extractor fans would perform optimally as designed.

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