01 July 2024
Bathroom zoning plays a critical role in ensuring safe, compliant ventilation installations within residential properties. Defined by the IET Wiring Regulations, bathroom zones help determine where electrical equipment, including extractor fans, can be safely installed based on exposure to water and moisture.
Understanding these zones, alongside the correct IP (Internal Protection - sometimes referred to as Ingress Protection) ratings, is essential for specifying and installing ventilation solutions that meet Building Regulations and industry best practice. This guide explains how bathroom zones are classified and how to select suitable ventilation products for each area, helping to deliver safe, efficient, and compliant installations.
Everything you need to know about bathroom zoning and IP ratings
The IP rating normally has two digits:
Protection from solid objects or materials
Protection from liquids (water)
All bathroom extractor fans are given an IP rating, which relate to which zones they are suitable for. The first digit of an IP rating describes its protection against solid materials such as dust and debris, and the second digit relates to the extractor fans protection from water and moisture. The higher the number, the more protection it has. If the first digit is shows an X this means that the product has not been tested against solid materials, this is usually because the unit will not come into contact with many solid objects.
Fans installed within Zones 1 or 2 need to be a minimum of IPX4, suitable RCD protection (30mA) is required for all mins fans and cables running into or protruding into a bathroom.
Recommended extractor fans which are rated to a minimum of IPX4 include:
QURO® is a low profile, quiet running, powerful ventilation unit which is flexible to meet the requirements of all wet rooms in a property including a kitchen, bathroom, utility, en-suite and WC.
The INFINITY 8 is a continuous running extractor fan suitable for WCs, bathrooms, utility rooms and kitchens. It is a major advancement in extractor fan technology; it utilises a centrifugal impeller and our Intellitrac technology which ensures extremely high airflow performance and humidity levels are controlled all year round.
The ECO DMEV+ is a continuous running decentralised extract fan that is suitable for wall and ceiling installations, designed to solve ventilation problems in all domestic wet rooms. It has been designed and developed to offer the market a fan with constant volume, low power consumption, low noise levels and low life-cycle costs.
The ECO DMEV+LC is a decentralised extract fan that can run be ran either continuously or intermittently. It is suitable for wall and ceiling installations, designed to solve ventilation problems in all domestic wet rooms. The ECO DMEV+ has been designed and developed to offer the market a fan with constant volume, low power consumption, low noise levels and low life-cycle costs.
The CYCLONE 8 is a continuous running extractor fan suitable for WCs, bathrooms, utility rooms and kitchens. It is a major advancement in extractor fan technology; it utilises a centrifugal impeller and our Intellitrac technology which ensures extremely high airflow performance and humidity levels are controlled all year round.
The CLASSIC 100 is a 100mm domestic intermittent axial extractor fan for wall, panel, window or ceiling installations, designed to solve ventilation problems in WCs and bathrooms.
The SILENT DESIGN 100 is a 100mm domestic axial extractor fan that comes with a stylish solid facia that is suitable for wall or ceiling installations, designed to solve ventilation problems in WC's and bathrooms.
The SILENT 100 is a 100mm domestic axial bathroom extractor fan for wall, ceiling and window installations, designed to solve ventilation problems in WCs and bathrooms.
The SILENT DUAL is an autonomous and intelligent extractor fan for bathrooms and WCs. It automatically adjusts its performance according to the environment and ventilation requirements via two sensors: a presence detector and adjustable humidity sensor.
The PROFILE 100 is a 100mm ultra slimline axial extract fan for wall, ceiling and window installations. It is designed to solve ventilation problems in WCs and bathrooms.
The EBB-N fans are powerful, domestic extractor fans that are suitable for wall or ceiling mounted installations. These can be either on the surface or flush mounted as well as on surface or built-in installations, designed to solve ventilation problems in all wet rooms.
The EBB Design fans are powerful domestic extractor fans that are suitable for wall or ceiling mounted installations, designed to solve ventilation problems in all wet rooms.
Frequently Asked Questions
Most of envirovent's extract fans are IPX4 rated or higher. This means they are suitable to be installed within Zone 1, or Zone 2 of a bathroom, or outside the zones, as long as a suitable RCD is protecting the circuit.
Centralised ventilation systems such as MEV, MVHR, and PIV are not suitable for installation in a wet room.
This will depend on the suitability of the consumer unit.
SELV fans offer extra safety when fitting a fan in a zone in a bathroom. However if the circuit they are being installed on is protected by a suitable RCD, then either a mains fan or SELV fan can be fitted.
It would always be recommended to install any transformer out side of the bathroom.
Regulation 531.3.3 of BS7671 IET wiring regulations forbids the use of Type AC RCD where fixed alterations or additions to an electrical circuit contain DC components.
Unfortunately nearly all ventilation products contain DC components to control the operation of the unit. Therefore a type AC RCD is not suitable.
An RCD is a protective device and is required when ventilation units are installed in specific areas, mainly in bathrooms.
Most current consumer units offer this type of protection as standard within the consumer unit. RCD's generally have a test button and should be tested on a regular basis.
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