Ventilation Requirements - REMEHA W40 Installation And Maintenance Instructions Manual

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:
Total input rating Position of air
of boilers
up to 2 MW High level
up to 2 MW Low level
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.
Minimum air vent area
(direct from outside)
vents
270 cm 2 plus 25 cm
per kW in excess of
60 kW total input
2
540 cm plus 4.5 cm
per kW in excess of
60 kW total input
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.
2
2
18
remeha W40/60-m ECO