The common bathroom fan size in Australia is 150mm in diameter to suit the standard ceiling exhaust cover.
Bathroom exhaust fans are standard size in Australia. Building Code of Australia (BCA) Ventilation Requirements are outlined below.
The Building Code of Australia sets out minimum requirements for proper ventilation in large bathrooms. The regulations say you must have a bathroom exhaust fan in the bathroom as it has been found that moist air doesn't flow into or out of your bath or shower. 1 CFM per square foot is compulsory.It stays in there and pollutants build up on the walls and ceiling of the room. An exhaust fan or ceiling fans move air through this space once every five minute, moving 25 litres per second, which is considered to be adequate cleansing.
The regulations say that a bathroom fan needs to be strong enough to suck out 25 litres of air per second when it is installed.
The common bathroom fan size in Australia is 150mm in diameter to suit the standard ceiling exhaust cover. It is not uncommon for a bathroom exhaust fan to have a 150mm, 200mm diameter body with a matching cover and grille that will seal an opening in the ceiling. The rating means the diameter of the bathroom fan body plus the grille. This is commonly referred to as a 3" fitting (150mm+grille).
Bathroom extractor fans or ceiling mounted bathroom exhaust fans. These are best for bathrooms because they prevent steam build up inside your walls and ceilings. Wall mount bathroom fan that can be fitted over your hot water system or near any existing outlet, eg beside a sink. Bath fan provide ventilation just where you need it without sucking moisture out of other rooms. Operation of a bath fan depends on wind passing through them above certain temperatures so they are not suitable for sub-floor installation. Wall-mounted ducted bath ventilation. These require a high level of installation skills, knowledge and fitting accessories; they are best left to AC companies or professionals. Other options can include inline fans, a fan with built in heaters, a fan with multiple functions, built in light (there's a light bulb), and more. There are a few fan options that work with a motion sensor. The fan will turn on if motion is detected. Some low sound level and noise level fans are available to install in the house. They can be installed in an enclosed space, ceiling joists, wall, attic (if attic access possible), and more. Replacing an old fan with them is possible. While installing, connect them with the existing wiring. The duct work depends. Installing and replacing isn't much hassle. Take care of sone rating.
They do not normally come with an “out” connection like extractors; although some manufacturers now offer models with return grilles and inlet flaps.
Bath fans or ceiling exhaust fans are measured the same way as most bathroom fans - they are measured by the diameter of the new fan body and then you add the duct diameter. The CFM rating indicates how much air a particular model can move per second, so select units that have a high CFM rating. To determine how powerful a bathroom exhaust fan needs to be in order to perform efficiently you can use the formula below: The volume of area x 26 litres per second = cubic feet per minute (minimum cfm) needed for your room (small bathrooms). Divide number by 60 = cfm required for your room from your fan. Example 1: A small bathroom measuring 2.4m x 1.8m and with an electrical rating of 240 volts and 3 amps will require a minimum 100 cfm extractor to remove sufficient moisture and pollutants. If you cannot measure accurate volumes and have only an idea of the size or area of a room, use a general guide to determine how much volume you have: Room dimensions in metres x 0.5 = cubic metres of space. Cubic metre of area x 1.2 = cubic feet (6.1 litres for larger bathrooms. Measurement in square feet isn't applicable here. A bathroom with over 100 square feet, an appropriately sized fan should be installed.