40
ENGLISH
Table 1.1 A
Room
Minimum intermittent extract rate
Continuous rate
Minimum high rate
Minimum low rate
Kitchen
30 l/s (adjacent to hob);
Total extract rate
or 60 l/s elsewhere
13 l/s
must be at least
Utility room
30 l/s
8 l/s
the whole building
Bathroom
15 l/s
8 l/s
ventilation rate in
Sanitary Accomodation
6 l/s
Table 1.1B
Table 1.1 B
Number of bedrooms in dwelling
1
2
3
4
5
Whole building ventilation rate (l/s)
13
17
21
25
29
Minimum value in any dwelling of 0,3 l/s per m
2
floor area
BUILDING REGULATIONS DOCUMENT F1 2006
CONTINUOUS MECHANICAL SUPPLY & EXTRACT
VENTILATION WITH HEAT RECOVERY
A continuous balanced mechanical central supply and extract system to
be positioned in loft or cupboard space. An integral heat exchanger
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
background ventilators in the dwelling.
CONTINUOUS SUPPLY AND EXTRACT
1
Determine the whole building ventilation rate from
Table 1.1B
Allow for infiltration by subtracting
- for multi storey dwellings: 0.04 x gross internal volume of dwelling
heated space (m
3
)
- for single storey dwellings: 0.06 x gross internal volume of dwelling
heated space (m
3
)
2
Calculate the whole dwelling extract rate at
maximum operation
by
adding the individual room rates for
‘minimum high rate’
from
Table 1.1A
3
The required air flow rates as as follows:
Maximum Extract Rate (boost)
is the greater step of 1 and 2 above.
The Minimum individual room extract rates sholuld be at least those
given in
Table 1.1A
for minimum high rate
Minimum
air supply rate should be at least the whole building
ventilation rate in 1 above.
4
No Background ventilators are required with System 4
In addition, the minimum ventilation rate should not be less than 0.3 l/s per m
2
internal floor area (this includes each floor, e.g.
for a two-storey building, add the ground and first floor 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
default value. If a greater level of occupance is expected, then add 4 l/s per occupant.
SYSTEM 4
12.Guide pratiche.qxd 18-12-2007 9:10 Pagina 59
BATHROOM
BEDROOM
HEAT RECOVERY
UNIT
KITCHEN
LIVING
ROOM
