There are many safety reasons for not trying to install or build range hoods systems. First of all, range hoods are in place to make sure that you direct dangerous fumes away from the rest of your home. They are also in place to help keep steam and smoke out of your kitchen as well as prevent smells from moving all around your home. If you don't have a range hood in your home, you can set yourself up for dangerous fires too if the heat should become too high on your range.
Why have a range hood?
 The continued presence of cooking fats, grease, steam and odours are an ongoing problem in every kitchen.
Every year, an average of 4 1/2 litres (1 gallon) of cooking fat deposits itself on the cooler surfaces of walls, ceilings and cupboards.These deposits condense and cause discolouration and dulling of paint work.
Range hoods filter out the kitchen grease saving you hours of cleaning, extending the time between repainting and giving you a cleaner, fresher kitchen, as well as protecting and adding to the value of your home.
How to select your range hood
The efficiency/extraction rate of the range hood is measured by the volume of air passed through the hood. The measurement is m3 per hour.
To ensure that the range hoods meet your cooking requirements, the following needs to be considered:
- As a rule the air should be changed in a kitchen, 12 times an hour.
- Multiply the floor area in square metres x the height of the kitchen in metres.
Divide the extraction rate m3 /hr of the hood by the calculated figure from step one. As an absolute minimum the rate should be in excess of 7 times per hour.
Types of range hoods
There are three general types of ready-to-install range hoods. Within this sub-topic we'll briefly examine each of the three types while also discussing some optional features.
 Island range hoods:
This type of range hood often accompanies an downdraft in which attachment to an exterior wall isn't an option. In many cases a retractable intake device is raised from the range or counter in order to pull air into exhaust ducts set below floor level.
The ability to retract the range hoods and the sleek nature of many island range hoods models makes the island range hoods models more stylish than many under-cabinet models.
 Wall Mount range hoods:
Large, stylish, and professional in appearance, wall mount range hoods continue to gain popularity among homeowners. Often used on exterior walls when a cabinet isn't available, wall mount range hoods resemble an upside-down chimney in appearance. Stainless steel finishes are common on wall mount range hoods, and wall mount range hoods models are considered the most stylish of the three types.
 Under-cabinet:
Traditional and usually the least expensive type of range hood, under-cabinet range hoods are, in fact, usually mounted under a wall cabinet and attached to an exterior wall. In many models, air is pulled out of the kitchen through an exhaust duct in the exterior wall. As a general rule, under-cabinet models aren't decorative or trendy.
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