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If you don't have access to
an outside wall, you will need a recirculation hood, which passes the air
through charcoal and grease filters before returning it to the kitchen.
However, they are not as effective as ducting air away to the exterior
source, which extraction hoods do.
It's important to choose the right size extractor for your hob and your
kitchen, and there's a simple calculation to work this out. Just multiply the
volume of your kitchen (length by width by height in metres) by ten (the
minimum number of times per hour the extractor will filter the air) and you
will arrive at a figure which gives the minimum extraction rate, expressed as
cubic metres per hour (m/h). All manufacturers provide this figure. Also pay
attention to what the hood looks like. It will usually be the centrepiece of
your kitchen and you don't want to buy one that looks like it belongs in a
chip shop, as some of the cheaper options invariably do.
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