Bosch HMT72G450B Specifications download pdf (Page 4)

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 ﬂ ow 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

ﬂ exible hose has to be used, ensure it is pulled tight to

smooth out the ridges before ﬁ xing.

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-efﬁ cient and much

easier to install. Air is passed through the metal ﬁ lter to extract

the grease and then through a special charcoal ﬁ lter, which

removes odours. The puriﬁ ed air is then returned to the room.

As no ducting openings are necessary, this is an energy efﬁ cient

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 efﬁ cient 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

ﬁ nished 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 ﬁ lters to ensure optimum

extraction performance. All of our metal grease ﬁ lters, brushed

steel ﬁ lters and rim ventilation ﬁ lters are dishwasher-proof.

Recirculation kit

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Bosch HMT72G450B Specifications Page 4

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