Ducted or recirculation mode?
Ducted extraction
Ducting out is the most effective method of extraction if the
hood can be sited on an outside wall, or an outside wall can
be reached via ducting. The main difference between ducted
and recirculation cooker hoods is that ducted systems can
extract steam and odours, as well as grease. All our extractors
are now standardized to a 150mm diameter outlet for easier
installation. Use of 120/125mm diameter ducting is also
possible, but will result in reduced air flow and increased
noise. Use of 100mm diameter ducting is not recommended.
The following points should be observed for optimum
ducted extraction results:
1. Ensure any pipe elbow bends are at least 30cm from the
hood ducting opening.
2. Avoid reducing the diameter or area of the ducting.
3. Use wide-angled pipe elbows, but keep the number used to
a minimum.
4. Only install pipes with smooth, even inner surfaces. If a
flexible hose has to be used, ensure it is pulled tight to
smooth out the ridges before fixing.
5. Avoid reducing the diameter or area of the ducting.
6. Use ducting pipes with a diameter of at least 120mm, but
ideally 150mm.
7. Keep piping to a minimum – use the most direct route to
external outlet.
8. Make sure that there is an adequate supply of fresh air to
replace the air ducted out of the kitchen i.e. windows that
can be opened, doors to adjacent rooms, air bricks.
Problems with installation may occur if points 1 to 8 are not
observed.
Cooker hoods with recirculation are energy-efficient and much
easier to install. Air is passed through the metal filter to extract
the grease and then through a special charcoal filter, which
removes odours. The purified air is then returned to the room.
As no ducting openings are necessary, this is an energy efficient
method of extraction as no energy can escape (ie. cool air in the
summer or warm air in the winter), making it a good choice for
low energy houses. The kit contains all you need to set the hood
up for recirculation and installation is relatively easy. Check each
model for details on the appropriate recirculation kit accessory.
Tips and hints
1. Calculate the extraction capacity needed.
2. Choose a hood with at least the same width of your hob.
3. Ensure efficient pipe ducting installation.
4. The hood should be installed at a minimum of 65cm above a
gas hob or 55cm above an electric hob.
5. To effectively remove cooking odours from your kitchen, switch
the hood on 5-10 minutes prior to cooking.
6. Leave the hood to run at a low setting after cooking has
finished for 5-10 minutes to remove any lingering odours.
Or simply select the Automatic After Running function, which
enables the hood to continue running at a low speed for 10
minutes before automatically turning itself off (available on
selected models).
7. Regularly clean metal grease filters to ensure optimum
extraction performance. All of our metal grease filters, brushed
steel filters and rim ventilation filters are dishwasher-proof.
Recirculation kit
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260 | Hoods installation tips
