MHS Boilers REGENCY 4 MODULEK/169 - Air Supply by Mechanical Ventilation

10
Low level 540 cm
2
plus 4.5 cm
2
per
(inlet) kilowatt in excess of 60 kW
total rated input (gross)
The actual minimum effective areas of the air vents required are as follows:
BOILER MODEL POSITION AREA OF VENT
OF AIR VENT (Air direct from outside)
High Level 567 cm
2
per boiler
Regency 4 Modulek-152
Low Level 1133 cm
2
per boiler
High Level 615 cm
2
per boiler
Regency 4 Modulek-169
Low Level 1230 cm
2
per boiler
High level 663 cm
2
per boiler
Regency 4 Modulek-186
Low Level 1326 cm
2
per boiler
High level 709 cm2 per boiler
Regency 4 Modulek-203
Low Level 1418 cm
2
per boiler
High level 757 cm2 per boiler
Regency 4 Modulek-220
Low Level 1514 cm
2
per boiler
High level 808 cm
2
per boiler
Regency 4 Modulek-237
Low Level 1615 cm
2
per boiler
High level 856 cm2 per boiler
Regency 4 Modulek-255
Low Level 1712 cm
2
per boiler
High level 907 cm
2
per boiler
Regency 4 Modulek-272
Low Level 1813 cm
2
per boiler
2.4.2
AIR SUPPLY BY MECHANICAL VENTILATION
Mechanical ventilation systems serving the area containing the boiler should be designed
with an extraction air rate of 0.45 m
3
/sec per 1000 kW total rated input, and an inlet air
rate of 1.1 m
3
/sec per 1000 kW total rated heat input.
Systems employing an extract fan only must not be used, whereas the use of a single inlet
fan, or an inlet together with an extract fan is acceptable.
All air inlet and extract fans should be electrically interlocked to cause safety shut-down
or lock-out of the boiler in the event of malfunction of either fan.
The requirements of mechanical ventilation schemes is fully outlined in BS.6644.