18
remeha W40/60-m ECO
Total input rating
of boilers
up to 2 MW
up to 2 MW
Position of air
vents
High level
Low level
Minimum air vent area
(direct from outside)
270 cm
2
plus 25 cm
2
per kW in excess of
60 kW total input
540 cm
2
plus 4.5 cm
2
per kW in excess of
60 kW total input
These recommendations are considered to be adequate
unless plant is to be operated at, or near, maximum out-
put during summer months when additional ventilation
may be required.
7.4 Ventilation requirements
a. Open flue installations
The requirements for high and low level ventilation open-
ings which MUST be provided are contained in detail
within BS 6644.
Openings must be permanent, communicate direct to
outside and be positioned so as to avoid blockage,
flooding or high velocity draughts within the boilerhouse.
The minimum free area of openings are shown in the
table:
b. Room sealed installations
Boilers require no air for combustion but air may be
required to ventilate the boiler house and remove any
excess heat generated by auxiliary equipment. BS 6644
requires that boiler house temperatures shall not
exceed:
- at floor level (or 100 mm above floor level) 25˚C
- at mid level (1.5 m above floor level) 30˚C
- at ceiling level (or 100 mm below ceiling level) 40˚C.
