11
VENTILATION AND COMBUSTION AIR
REQUIREMENTS
1.
It is imperative that there is sufficient air supply
to the burner of the cooker in order to support
correct combustion.
2.
The air supply to this appliance must comply
with BS 5410 Part 1.
3.
The minimum effective air requirement for this
appliance is 65cm
2
. When calculating combus-
tion air requirements for this appliance use the
following equation: 550mm
2
per kW of maximum
rated output above 5kW. These requirements
are illustrated in OFTEC Technical Book No. 3 &
B.S. 5410.
4.
If there is another appliance using air fitted in the
same or adjacent room, it will be necessary to
refer to B.S. 5410 to calculate the additional air
supply.
5.
All materials used in the manufacture of air
vents should be such that the vent is dimen-
sionally stable and corrosion resistant.
6.
The effective free area of any vent should be
ascertained before installation. The effect of
any gauze or screen should be allowed for when
determining the effective free area of any vent.
7.
Air vents direct to the outside of the building
should be located so that any air current pro-
duced will not pass through normally occupied
areas of the room.
An air vent outside the building should not be
located less than the dimensions specified with-
in the Building Regulations (See Technical Data)
from any part of any flue terminal. These air
vents must also be satisfactorily fire proofed in
accordance with the current Building
Regulations.
8.
Air vents in internal walls should not communi-
cate with bedrooms, bedsits, toilets, bathrooms
or rooms containing a shower.
9.
Air vents traversing cavity walls should include a
continuous duct across the cavity. The duct
should be installed in such a manner as not to
impair the weather resistance of the cavity.
10. Joints between air vents and outside walls
should be sealed to prevent the ingress of mois-
ture. Existing air vents should be of the correct
size and unobstructed for the appliance in use.
11. If there is an air extraction fan fitted in the room
or adjacent rooms where this appliance is fitted,
additional air vents will be required to eleviate
the possibility of spillage of products of combus-
tion from the appliance/flue while the fan is in
operation. (Refer B.S. 5410).
12. Where such an installation exists, a test for
spillage should be made with the fan or fans and
other burning appliances in operation at full rate.
(i.e. extraction fans, tumble dryers) with all
external doors and windows closed.
13. If spillage occurs following the above operation,
an additional air vent of sufficient size to prevent
this occurrence should be installed. As a gener-
al guide an extra 50 cm2 of air vent free area will
be sufficient for most situations.
OUTSIDE AIR CONNECTION
This appliance may be connected direct to the out-
side of the house for its air supply.
1.
If this option is used a special kit is available to
order.
2.
Additional combustion air is not required as indi-
cated in B.S. 5410.
3.
Remove air inlet plate on front right hand side,
replace it with the blanking plate located at back
left hand side (see fig.15).
4.
The left hand side of the appliance must remain
open to provide cool air for the programmable
timer.
5.
Connect the optional 125mm (5”) spigot to the
base. (see fig. 16)
6.
To connect this cooker to an outside air supply
use the special order kit.
7.
Air inlets traversing cavity walls should include a
continuous duct across the cavity. The duct
should be installed in such a manner as not to
impair the weather resistance of the cavity. This
duct should be satisfactorily fire proofed in
accordance with the current Building
Regulations.
8.
Joints between air vents and outside walls
should be sealed to prevent ingress of moisture.
