Bosch GREENSTAR HEATSLAVE II EXTERNAL 12/18 Service Manual download pdf (Page 19)

1919

Conventional flue† – minimum air vent area (cm

) for

appliances installed in a compartment

Internal ventilation* External ventilation**

kW High level

(D)

Low Level

(C)

High level

(D)

Low Level

(C)

12/18 198 279 99 198

18/25 275 413 138 275

25/32 352 528 176 352

*Internal air to and from a space/room inside the building.

**External air to and from directly outside the building.

† Due to changes to BS 5410 and modern building design, these figures no

longer incorporate the adventitious ventilation allowance.

Room-sealed flue† – minimum air vent area (cm

) for

appliances installed in a compartment

Internal ventilation* External ventilation**

kW High level

(D)

Low Level

(C)

High level

(D)

Low Level

(C)

12/18 198 198 99 99

18/25 275 275 138 138

25/32 352 352 176 176

Air supply

CF (conventional flue)

An adequate supply of free air must be delivered to the boiler

for combustion purposes through a permanent inlet, such as

an air brick, into the area where the boiler is situated.

Combustion air must not be taken from bathroom or

bedroom areas.

Minimum area of air inlet for combustion*

kW Area

12/18 99cm

18/25 138cm

25/32 176cm

* Due to changes to BS 5410 and modern building design,

these figures no longer incorporate the adventitious

ventilation allowance.

Compartment installation

Internal ventilation External ventilation

Compartment ventilation

A Compartment

B Boiler

C Low level vent

D High level vent

E Air supply

Follow the requirements of BS 5410 and note:

•

Minimum clearances must be maintained

•

An access door is required to install, service and

maintain the boiler as well as any ancillary equipment,

i.e. condensate trap

•

If ﬁ tting the boiler into an airing cupboard use a non-

combustible material to separate the boiler from the airing

space. If the material is perforated, the holes must not

exceed 13mm.

Compartment ventilation

•

Ventilation must be provided for boilers ﬁ tted into

compartments as described in BS 5410

•

A minimum of 2 air vents must be ﬁ tted, one at low level

the same air (E) for circulation

•

Free air must not be taken from a room or internal space

containing a bath or shower and must not communicate

with a protected area such as a hall, stairway, landing,

corridor, lobby, shaft, etc.

•

Air vents must allow access for clean, free air and

must be sited to comply with the ﬂ ue terminal

position requirements

•

Air ducting runs must not exceed 3 metres.

•

Low level air vents must be within 450mm from

the ﬂ oor

•

A warning label must be added to the vents with a

statement to the effect: “Do not block this vent.

Do not use for storage”.

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