ELICA HOOD User Manual download pdf (Page 2)

54mm

110mm

60mm

204mm

90mm

220mm

Up to 250m

/ hr

Up to 500m

/ hr

500m

/ hr & above

Because it is normally hidden, a ducting system is often not con-

sidered an important part of the construction or refurbishment

of a building. However, the importance of the correct ducting is

slowly becoming recognised by the building industry.

It is not always the fault of the cooker hood manufacturer when

dreams of fresh kitchens and low noise are not achieved. It can

often be that the size or conﬁ guration of ducting has been in-

correctly selected by the installer or system designer.

As it cannot be seen, air movement is often made more com-

plicated than it actually is. Air moves just as water moves and

it is sometimes useful to visualise a problem by substituting it

with water.

In ventilation installations the aim is normally to move the air

from its source to the outside of the house as eﬃ ciently and qui-

etly as possible. It is, therefore, common sense that to do this

eﬀ ectively, the shorter the distance that the air has to travel,

the quicker the aim is achieved. It is also common sense that

if an obstacle is put in the way, such as a bend, the process will

become more diﬃ cult as the air will lose its momentum and

require more powerful assistance in order to achieve the aim.

Cooker hoods vary in power just as cars do and the results are

reﬂ ected in much the same way. A high performance/speciﬁ ca-

tion car should be quieter, last longer and generally provide the

driver with more comfortable and satisfactory results. However,

to ensure this, the car needs a straight smooth road on which

to travel eﬀ ectively. The road for the air to travel when using a

cooker hood is the ducting. Again, it is common sense that a

more powerful cooker hood would need a more eﬃ cient duct

– a Rolls Royce owner would not consider driving their car oﬀ -

road! It is worth remembering that many cooker hood manu-

facturers’ guarantees will be invalidated if the correct size of

ducting is not used to match the power of the cooker hood.

A few key installation guidelines can be applied to help ensure

that the ducting selection is correct and installed in a way that

optimises the cooker hoods’ performance.

• Choose the shortest and most direct route to outside.

• Ensure that bends are kept to a minimum.

• C

heck the extraction capability and connection size of the

cooker hood and choose an appropriate size of ducting. Refer

to the cooker hood manufacturer for performance ratings

and speciﬁ cations.

• A round duct provides optimu

m airﬂ ow performance and

should be used if installation space allows.

• Rectangular or ﬂ at channel ducting is an excellent alternative

when space is restricted. Its low proﬁ le enables the ducting

to be easily concealed in the ceiling void or along the top of

wall units.

• A rigid duct is more eﬃ ci

ent than a ﬂ exible duct and should

be used whenever possible.

• If ﬂ exible hose

is used, the hose should remain taut and as

straight as possible.

• Provision should be made for make up air. In most dwellings

this is catered for by natural leakage. However, some high

performance products may require the installation of an air

supply set.

Important

If installing a cooker hood in a room containing an open-

ﬂ ued fuel-burning appliance (ie non-balanced ﬂ ue), there

must be suﬃ cient replacement air to prevent fumes being

drawn back down the ﬂ ue when the cooker hood is set to

maximum extract.

Exhaust air must not be discharged into a ﬂ ue used for exhaust-

ing fumes from appliances supplied with energy other than

electricity. When deciding the method for exhaust air discharge

and intake ﬂ ow rates, the requirements of all relevant authori-

ties must be strictly adhered to.

If the duct passes through an unheated roof void the duct should

be insulated to reduce the formation of condensation. A vertical

duct should also be installed with a weatherproof roof cowl of

suﬃ cient free area for the air volume. A condensation trap must

be ﬁ tted in order in order to alleviate condensation build-up.

Horizontal ducts should fall away from the cooker hood.

Choosing and Installing the Correct Cooker Hood Ducting

Application

Particularly suitable for applications requiring lower

extraction rates, such as the ventilation of lower

powered cooker hood with 100mm exhaust spigots,

domestic bathrooms and internal WCs. Provides

efficient ducting for short, simple runs.

deal for the ducting of medium powered kitchen

cooker hoods and fans with 125mm round exhaust

spigots. Highly efficient even for long runs, and with

appliances of a high extraction rate.

Ideal for the ducting of very high powered cooker

hoods, especially those with 150mm exhaust spigots.

This highly efficient rectangular duct has a comparable

airflow performance of a 150mm round duct, but its

lower profile provides the fitter or system designer

with greater installation flexibility.

Dimensions

Flat channel outer dimensions are

110 x 54mm and fit into system parts sockets.

Minimum space required:

115 x 60mm

Flat channel outer dimensions are

204 x 60mm and fit

into

system parts

sockets.

Minimum space required:

210 x 65mm

Flat channel outer dimensions are

220 x 90mm and fit

into

system part

sockets.

Minimum space required

: 227 x 97mm

Cross Section

Free Area: 5300mm

Free Area: 11200mm

Free Area: 17968mm

Size

4" (100mm)

5" (125mm)

6" (150mm)

• Made from ﬂ ame retardant self

extinguishing materials to conform to

US ﬁ re standard UL94 V2 and also to

DIN 4102 B1

• Maximum working temperature

of 60˚C

• Bends and adapters meet most

installation requirements

• Lightweight and easy to install

1 2 3 4 5 6

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ELICA HOOD User Manual Page 2

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