I-UDSA-UK (02-19) PN 06 00116 UDSA R3, page 8
AIR SUPPLY
It is important to ensure that there is an adequate air supply
at all times for both combustion and heating requirements.
Modern buildings involve greater use of insulation, improved
vapour barriers, and weather proofing. These practices mean
that buildings are sealed much tighter than in the past.
Proper combustion air supply for a power vented Type B
installation requires ventilation of the heated space. Natural
infiltration of air may not be adequate. Use of exhaust fans
aggravates this situation. It is important to ensure that there
is adequate combustion air supply at all times. Reliance on
doors and windows is not allowed.
Warning: When these air heaters are installed in type
B applications, designed to take air for combustion
from the space in which it is installed. Do not restrict
the combustion air intake.
Always ensure that adequate combustion air is provided
to suit the total installation of all combustion equipment
in accordance with BS6230 or BS5440 as appropriate.
Ensure that the air combustion inlet opening at the rear side
of the unit cannot be obstructed (see Figure 3).
Combustion air inlet pipe & flue pipe for balanced
flue installation (type C appliances)
Balanced flue air heaters are designed to be fitted with a
combustion air inlet duct that obtains outdoor air and a flue
pipe that exhausts flue products to outdoors. Both the flue
and combustion air pipes must be sealed.
Type C2 appliances must not be applied !
Figure 4 : Approved appliances type C
C52
C32/C62
C12
C12b/C62
Figure 5 : Type C appliances : combustion air and flue pipe sockets
1) Flue pipe outlet collar
2) Combustion air pipe inlet collar
All models except 035-4E, 043-4E, and 050-4E
Models 035-4E, 043-4E, and 050-4E only
