HAMWORTHY HEATING LTD
MILBORNE 500 SERIES
500001130/A
16
9.0 Ventilation
All fuel burning appliances consume a quantity of air
proportional to their power. Efficient ventilation of
the installations premises is therefore necessary in
accordance with the applicable standards.
Single Milborne 501 installations
A single Milborne 501 boiler having a rated input of
50kW requires ventilation in accordance with
BS5440 Part 2.
Modular Milborne boiler installations
Multiple or modular Milborne boiler installations
having a rated input in excess of 77kW require
ventilation in accordance with BS6644.
Single Milborne 501 installations
Room sealed appliances
Detailed recommendations for air supply are given
in BS5440 Part 2. The following notes are intended
for general guidance only.
Where the boiler is to be installed in a room or
internal space, the boiler does not require the room
or internal space containing it to have a permanent
air vent.
Where the boiler is to be installed in a cupboard or
compartment, permanent high and low level air
vents are required for cooling purposes in the
cupboard or compartment. Both vents must
communicate with the same wall to outside air.
The minimum effective area of the permanent air
vents required in the cupboard or compartment are
given in table 1.
adjacent room or internal space.
The permanent vent to outside must be no less than
215 cm
2
.
Where ventilated to an adjacent room or internal
space that room or internal space must be ventilated
directly to outside air. The minimum vent size to
outside will be no less than 215 cm
2
. Additionally a
vent will be provided between the two rooms or
internal spaces sized at no less than 215 cm
2
.
If required the room or internal space may be vented
across more than one adjacent room or internal
space. In addition to the above requirements the
vents between rooms or internal spaces must be
increased to no less than 323 cm
2
. The final vent to
outside will remain at 215 cm
2
.
Where the boiler is to be installed in a cupboard or
compartment, permanent high and low level air
vents are required for cooling purposes in the
cupboard or compartment. Both vents must
communicate directly with outside air or an adjacent
room or internal space. These vents must be
located as high and as low as practicably possible.
Both vents should be located on the same wall.
The minimum effective area of the permanent air
vents required in the cupboard or compartment are
given in table 2.
Position of air
vents
Air from room
or internal
space
Air direct from
outside
High level
500cm
2
250cm
2
Low level
500cm
2
250cm
2
Table 9.1
Natural draught appliances
Detailed recommendations for air supply are given
in BS5440 Part 2. The following notes are intended
for general guidance only.
Where the boiler is to be installed in a room or
internal space, the boiler must be provided with
permanent ventilation to either outside or an
Position of air
vents
Air from
room or
internal
space
Air direct
from outside
High level
500cm
2
250cm
2
Low level
1000cm
2
500cm
2
Table 9.2
Where ventilated to an adjacent room or internal
space that room or internal space must be ventilated
directly to outside air. The minimum vent size to
outside will be no less than 215 cm
2
. Additionally a
vent will be provided between the two rooms or
internal spaces sized at no less than 215 cm
2
.
If required the room or internal space may be vented
across more than one adjacent room or internal
space. In addition to the above requirements the
vents between rooms or internal spaces must be
increased to no less than 323 cm
2
. The final vent to
outside will remain at 215 cm
2
.
Vent general requirements
Air vents directly communing to outside must be
located such that they are not easily blocked by
debris, leaves, snow etc.
