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4.7.3 GENERAL VENTILATION REQUIREMENTS (TYPE B
DANGER
Flue type B
which the heater is installed and therefore the room or compartment must be ventilated to out-
side air. Only in exceptional circumstances can ventilation air be taken from inside (see IGEM/
UP/10 section 7 for details)
Adequate ventilation shall be provided to permit the safe operation of any appliance installed
within the room or space, including other fuel-fi red appliances which may be aff ected by the
installation of this gas appliance. If the installation of this appliance takes the total net kW input
in the room or space beyond 70kW, reference to BS6644 should be made.
Consideration shall be given to the purpose of the internal space from which ventilation is
provided. The internal space should not be part of a dwelling
The ventilation system (including mechanical ventilation) shall be designed such as not to cause
the installation space to be under suction to the extent that downdraft in the chimney system
could lead to a reverse fl ow of combustion products into the room or appliance.
When installing an appliance with a B
CO alarm is fi tted in the same room or compartment from which the air is drawn.
The temperature within a room, enclosure or balanced compartment, assuming ambient air
conditions of 15
4.7.4 OPEN FLUE APPLIANCE IN A DEDICATED PLANT ROOM
Installations in a plant room with ventilation direct to outside air require the following minimum free area of
permanently open vents at both low and high levels:
Heater Model
MAXXfl o EVO 90
MAXXfl o EVO 120
Installation
- Is an open fl ue appliance where air is drawn from the room or compartment in
23
O
C shall not exceed the following temperatures:
High level (100mm below ceiling level)
Mid level (1500mm from fl oor level)
Low level (100mm above fl oor level)
Minimum vent free area
fl ue system, it is recommended that a gas alarm and a
23
Minimum vent free area
(Low)
505 cm
2
675 cm
2
27
CLASSIFICATION)
23
40
C
O
32
C
O
25
O
C
(High)
340 cm
2
450 cm
2
MAXXfl o EVO
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