User's Manual

5756
New wall mounting system
Once you’ve chosen which option you want to go for and you’re ready to install, we have made life even easier.
Offset ‘cam’ rings mean that the fixings can be adjusted within a 6mm radius, making it simpler than ever to level
the hood when fixing it.
Ducting your hood
For optimum performance, your extractor hood should be ducted to the outside of the house using ducting with as large a
diameter as possible. The larger the ducting size, the greater the volume of air that can be extracted from the kitchen, and
the quieter the hood will be. All Siemens hoods are now suitable for use with a 150mm diameter ducting, which increases
efficiency and lowers noise levels even further, though 120mm ducting can still be used. Use of ducting with a lesser
diameter should be avoided if possible. Ducting lengths should be as short and as direct as possible to ensure that the air
is extracted to the outside as quickly as possible. Bends should be kept to a minimum and the ducting itself should be as
smooth as possible to ensure smooth, unobstructed airflow.
How to choose a hood.
With open-plan living becoming more of the norm, a quiet and efficient extractor is necessary to deal with the
strong cooking odours as well as the grease-laden air that can otherwise linger throughout the house. As far as
style and design is concerned, with the Siemens range of cooker hoods, you’ll be spoilt for choice. But there are
also two vital technical points to consider when choosing a hood. The first is whether you want the hood to be
ducted or re-circulating, and the second is its power rating – and what you will require depends on your kitchen
space. Here are some helpful pointers.
Choosing a hood: Ducted or re-circulated operation?
For optimum performance, your extractor hood should be ducted to the outside of the house, so that the extracted air is
vented outside. But sometimes it is just not practical for the hood to be ducted to the outside, so most Siemens hoods can
also operate in re-circulating mode (an additional carbon odour filter re-circulating kit is required to do this - please check
individual product specifications for details of suitable accessories). In re-circulating mode, the extracted air is passed
through the metal filter to remove grease, and then through a carbon filter to remove odours before being directed back
into the kitchen. Although the extraction rate is slightly lower (when using this method) than ducted extraction and the
odour filter will need to be replaced on a regular basis, recirculating the air offers an energy efficiency benefit, in that cool
air is retained in the home in the summer, and does not vent out warm air during winter months.
Choosing a hood: the power to perform
Your chosen hood must be powerful enough to
effectively remove moisture and cooking odours from
your kitchen. As a rule of thumb, the hood should
be able to change the air in the kitchen 10 times per
hour. Here is a quick calculation you can make to check
whether a hood is sufficiently powerful:
Firstly, calculate the volume of the kitchen
(H x W x D metres). Next, multiply that figure by 10.
The resulting figure is the minimum extraction rate you
require.
For example: Room: 4m x 4m x 2.5m = 40m
3
; 10 changes
per hour = 10 x 40m
3
= 400m
3
/h; so the hood must
achieve a minimum of 400m
3
/h.
Minimizing noise
To keep noise to a minimum, we would suggest selecting a model that can comfortably meet the aforementioned
requirements on an intermediate speed (e.g. level 2) rather than at the highest speed.