andrews MAXXflo EVOCWH 120/302 Installation And Maintenance Manual page 28

4.7.5 OPEN FLUE APPLIANCE IN A ENCLOSURE VENTILATED DIRECT
TO OUTSIDE AIR
Installations within a compartment ventilated directly to outside air must be ventilated at high and low level.
The minimum free area of permanently open vents must be as follows:-
4.7.6 OPEN FLUE APPLIANCE WITH MECHANICAL VENTILATION
Mechanical ventilation can be a combination of mechanical inlet and outlet and natural ventilation outlet. The
fans must be controlled so as not to cause a negative pressure (relative to atmospheric conditions) in the
plant room. The fans must be interlocked with the appliance. Minimum fl ow rate requirements as as follows:
Minimum fl ow rate with draught
Heater Model Low level Inlet
MAXXfl o EVO 90
MAXXfl o EVO 120
Installation
Minimum free vent area
Heater Model
MAXXfl o EVO 90
MAXXfl o EVO 120
diverters
High level Extract
360 m /h 175 m
3
475 m /h 235 m
3
Low level High level
1010 cm 590 cm
2
1350 cm 785 cm
2
Minimum fl ow rate without
Low level Inlet
/h 340 m
3
/h 452 m
3
28
2
2
draught diverters
High level Extract
/h 115 m
3 3
/h 155 m
3 3
/h
/h
MAXXfl o EVO