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BUILDING REGULATIONS DOCUMENT F1 2006
BUILDING REGULATIONS DOCUMENT F1 2006
SYSTEM 4
SYSTEM 4
CONTINUOUS MECHANICAL SUPPLY & EXTRACT
CONTINUOUS MECHANICAL SUPPLY & EXTRACT
VENTILATION WITH HEAT RECOVERY
VENTILATION WITH HEAT RECOVERY
A continuous balanced mechanical central supply and extract system to
A continuous balanced mechanical central supply and extract system to
be positioned in loft or cupboard space. An integral heat exchanger
be positioned in loft or cupboard space. An integral heat exchanger
recovers a large percentage of heat energy that would have otherwise
recovers a large percentage of heat energy that would have otherwise
been lost. In employing this type of system, there is no need to install
been lost. In employing this type of system, there is no need to install
background ventilators in the dwelling.
background ventilators in the dwelling.
CONTINUOUS SUPPLY AND EXTRACT
CONTINUOUS SUPPLY AND EXTRACT
1 Determine the whole building ventilation rate from Table 1.1B
1 Determine the whole building ventilation rate from Table 1.1B
Allow for in ltration by subtracting
- for multi storey dwellings: 0.04 x gross internal volume of dwelling
- for multi storey dwellings: 0.04 x gross internal volume of dwelling
3
heated space (m
3
)
heated space (m
)
- for single storey dwellings: 0.06 x gross internal volume of dwelling
- for single storey dwellings: 0.06 x gross internal volume of dwelling
3
3
heated space (m
)
heated space (m
)
2 Calculate the whole dwelling extract rate at maximum operation by
2 Calculate the whole dwelling extract rate at maximum operation
adding the individual room rates for 'minimum high rate' from Table 1.1A
adding the individual room rates for 'minimum high rate'
3 The required air flow rates as as follows:
3 The required air ow rates as as follows:
Maximum Extract Rate (boost) is the greater step of 1 and 2 above.
Maximum Extract Rate (boost)
The Minimum individual room extract rates sholuld be at least those
The Minimum individual room extract rates sholuld be at least those
given in Table 1.1A for minimum high rate
given in Table 1.1A
for minimum high rate
Minimum air supply rate should be at least the whole building
Minimum air supply rate should be at least the whole building
ventilation rate in 1 above.
ventilation rate in 1 above.
4 No Background ventilators are required with System 4
4 No Background ventilators are required with System 4
Table 1.1 A
Table 1.1 A
Room
R
o
o
m
K
t i
h c
e
n
Kitchen
Utility room
U
l i t
y t i
o r
o
m
a B
h t
o r
o
m
Bathroom
S
n a
a t i
y r
A
c
o c
m
o
d
t a
o i
n
Sanitary Accomodation
Table 1.1 B
Table 1.1 B
W
h
o
e l
b
u
d l i
n i
g
e v
n
i t
t a l
o i
n
a r
Whole building ventilation rate (l/s)
In addition, the minimum ventilation rate should not be less than 0.3 l/s per m
In addition, the minimum ventilation rate should not be less than 0.3 l/s per m
for a two-storey building, add the ground and rst oor areas).
This is based on two occupants in the main bedroom and a single occupant in all other bedrooms. This should be used as the
This is based on two occupants in the main bedroom and a single occupant in all other bedrooms. This should be used as the
default value. If a greater level of occupance is expected, then add 4 l/s per occupant.
default value. If a greater level of occupance is expected, then add 4 l/s per occupant.
36
is the greater step of 1 and 2 above.
Minimum intermittent extract rate
M
i n i
m
u
m
i
t n
r e
m
t i
e t
t n
e
t x
a r
t c
0 3
/ l
( s
d a
a j
e c
t n
o t
h
o
b
; )
30 l/s (adjacent to hob);
r o
0 6
s / l
l e
e s
w
h
e
e r
or 60 l/s elsewhere
30 l/s
0 3
s / l
5 1
s / l
15 l/s
6
s / l
6 l/s
e t
l (
) s /
Minimum value in any dwelling of 0,3 l/s per m
Minimum value in any dwelling of 0,3 l/s per m
by
from Table 1.1A
a r
e t
Continuous rate
C
o
t n
Minimum high rate
Minimum high rate
3 1
s / l
13 l/s
8 l/s
8
s / l
8
s / l
8 l/s
Number of bedrooms in dwelling
Number of bedrooms in dwelling
1
2
3
1
2
3
3 1
7 1
1 2
13
17
21
2
2
internal oor area (this includes each oor, e.g.
HEAT RECOVERY
UNIT
BATHROOM
KITCHEN
n i
u
o
s u
a r
e t
Minimum low rate
Minimum low rate
o T
a t
e l
t x
a r
t c
a r
e t
Total extract rate
m
u
t s
b
e
a
l t
a e
t s
must be at least
the whole building
the whole building
ventilation rate in
ventilation rate in
Table 1.1B
Table 1.1B
4
5
4
5
5 2
9 2
25
29
2
oor area
2
BEDROOM
LIVING
ROOM
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