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2.7 Ventilation requirements in the UK are as shown in the table
below:
A) Traditionally Built Homes
•Wheretheleakageisgreaterthan5m
3
/hour/m
2
.
•Ventilationnormallyrequired=550mm
2
per kW output
over 5kW
Output (kw) 4 5 6 7 8 9 10
A
Additional
ventilation
mm
2
None None 550 1100 1650 2200 2750
cm
2
None None 5.50 11.0 16.5 22.0 27.5
in
2
None None 0.89 1.77 2.66 3.55 4.40
B) Modern Construction Homes
•Wheretheleakageislessthan5m
3
/hour/m
2
.
•Ventilationnormallyrequired=550mm
2
per kW
Output (kw) 4 5 6 7 8 9 10
B
Additional
ventilation
mm
2
2200 2750 3300 3850 4400 4950 5500
cm
2
22.0 27.5 33.0 38.5 44.0 49.5 55.0
in
2
3.55 4.40 5.32 6.21 7.10 7.99 8.87
2.8 Permanent air vents should be non-adjustable and positioned
where they are unlikely to be become blocked.
2.9 If vents open into adjoining rooms or spaces there must be an
air vent of at least the same size direct to the outside.
2.10 Site the vents where cold draught is unlikely to cause
discomfort. This can be avoided by placing vents near ceilings
or close to the appliance, see diagram.
PRE-INSTALLATION CHECKS
1. FLUE
Model
CL Milner Brick - STMB
Flue/Chimney size
With or without flue liner system
Round (diameter)
mm 150min / 230max
inch 6min / 9max
Without flue liner system Square
mm 230 x 230
inch 9 x 9
Flue/Chimney
(minimum height)
All products
m 4.5
feet 13
Do not connect to systems containing large voids or flues over 230mm (9") square
2. VENTILATION
2.1 This appliance requires a constant supply of air to maintain
proper combustion and effective flue performance.
2.2 An inadequate air supply can result in poor combustion and
smoke entering the room which is potentially dangerous.
2.3 This supply of air can come from either:
—
The natural leakage of air into the room in which the
product is fitted.
—Purpose provided ventilation.
—Some Yeoman appliances can also be fitted with an
optional outdoor air kit which allows air to be drawn in
from the outside.
2.4 The amount of air required must comply with local building
regulations and the rules in force.
2.5 If spillage is detected during commissioning then there may
be insufficient natural ventilation and an additional air supply
will be necessary.
2.6 Many older buildings are sufficiently ventilated by natural
leakage of air to provide suitable air supply for an appliance
of 5kW output or less.
Modern building techniques have reduced the amount of air
that leaks in or out of a house. A modern construction with
an air tightness of less than 5m
3
per hour per m
2
requires an
air vent for ALL solid fuel appliances including those with a
rated heat output of less than 5kW.
NOTE: The air leakage of a modern house is tested at the
completion of construction and a certificate issued confirming
this.