Now we all know that electricity and water don t mix thus the need for the zones. Ducting is used in both residential and commercial environments everywhere from the kitchens in your home right through to supermarkets and factory floors.
The opening should have a typical area of at least 1 20th of the floor area of the room served unless it is a bathroom which can be any openable size.
Bathroom extractor fan ducting regulations. As you can see there are 3 zones 0 1 2 plus outside of this is an area called the outside zone and electrical equipment is categorised as to whether it is suitable for use in the relevant zones of the bathroom. 2 0 ventilation air inlets and discharge. Flexible ducting should be pulled taught to minimise.
A new bathroom should have a fan which extracts at a rate of at least 15 litres per minute and continues to run for 15 minutes after the light has been switched off. For centrifugal fans you are limited to 6 metres for extract rates of 6 to 30 l s and 3 meters for extract rates of 31 to 60 l s. For fans the regulations state that should it or other electrical appliances be fitted within zone 1 of the bathroom then a safety or separated extra low voltage or selv fan should be fitted as these as the name suggests are designed to operate with reduced voltage and.
When connecting to axial fans. The bathroom zones for extractor fans uk electrical regulations divide the bathroom into 4 zones. A bathroom extractor fan s projected cfm rate is usually stated on the outside of the packaging.
A bathroom fan must carry at least 20 cubic feet per minute cfm all the time and 50 cfm intermittently according to the healthy house institute. These zones are determined by their proximity to water humidity and condensation and the likelihood of the electrical items installed in those areas getting wet. To provide extract ventilation in a kitchen for the purposes of part f an extract fan to outside should have an installed capacity of at least 60 l s.
The general rules for ventilating a room are. In new build bathrooms with a bath and shower mechanical ventilation is required in the form of an extractor fan. You are able to incorporate up to 2 bends in a system up to 30l s this then reduces to 1 bend for higher extract rates.
The fan must duct to the outside. Purge this is achieved by opening the window. Building regulations state that bathrooms must be ventilated via a window or extractor fan you may want to use both.
Typically these products are made from various materials such as metal or fibreglass but residential applications tend to be plastic and are manufactured to meet current building regulations. This is because new builds are built to be more airtight so natural ventilation is much lower the ventilation requirements for a bathroom are 15 litres per second 54m3 per hour you might be wondering what the last point means.