7
ALPHA 700
8.0 air supply
& ventilation
An adequate supply of fresh air for combustion and ventilation of the boiler house must be supplied in
accordance with BS6644/BS5410 as appropriate.
The air supply should be achieved using:
a) Natural ventilation with low level and high level openings.
b) Using a fan to supply air to a low level opening with natural discharge through a high level opening.
c) Using a fan to supply air to a low level opening and a fan to extract air at a high level opening.
Where natural ventilation is used, suitable permanent openings connected directly to the outside air must
be provided. The openings should be fitted with grilles that cannot be easily blocked or flooded. The free
area of the grilles should be as follows:-
LOW LEVEL (inlet)
540cm
2
plus 4.5cm
2
per kW in excess of 60kW of total rated input.
HIGH LEVEL (outlet)
270cm
2
plus 2.25cm
2
per kW in excess of 60kW of total rated input.
10.0 clearances
The dimensions shown below are required for proper access for assembly and maintenance. There is
no requirement for clearance above the boiler.
Alpha boilers should be installed on a level
fireproof plinth with a minimum height of 100mm.
The plinth must be capable of supporting the
weight of the boiler/s when they are filled with
water. The front of the plinth can be level with, but
not extend beyond, the front of the boiler casing.
Depending on the make of burner selected, dual
fuel applications may require a higher plinth.
Details will be provided on request.
plinth details
B
A
≈
10cms
Plinth must be level and trowelled smooth.
300
136
112
340
150
112
380
163
112
425
177
112
470
190
112
510
204
112
555
217
112
600
231
112
640
244
112
Alpha 700
A cm
B cm
Model
300
340
380
425
470
510
555
600
640
Gas
580
580
580
580
580
580
840
840
840
Oil
470
470
470
470
470
470
680
680
680
Dual Fuel
610
610
770
770
770
770
920
920
920
Dimension X in mm
1000 min
1000
X
450 min
X + 200
(450 min)
9.0 boiler base
