Work Tops
Above Boiler (All Models)
100mm (4 in) Min
Sides
See
VENTILATION
Detailed recommendations for air supply are given in BS 5440:2.
The following notes are intended to give general guidance. The room in which the open flue unit is
situated requires an air vent which should be direct to outside or to a room which itself has an air
vent direct to outside. Where the boiler is in a compartment with air vents direct to outside the room
containing the compartment does not require the provisions of additional ventilation.
APPLIANCE
MINIMUM FREE
AREA OF AIR VENT
cm
2
in
2
80 OF
102
16
70 OF
84
13
60 OF
74
11.5
50 OF
57
9
40 OF
39
6
The actual minimum effective area requirements of cupboard/compartment air vents are based
upon the rated input of the appliance.
Ventilation areas required:
APPLIANCE
HIGH LEVEL
VENT AREA
LOW LEVEL
VENT AREA
cm
2
in
2
cm
2
in
2
80 OF
Compartment
271
42
542
84
70 OF
vented to
232
36
464
72
60 OF
adjacent
212
33
423
67
50 OF
room
176
27
353
55
40 OF
140
22
281
44
80 OF
Compartment
136
21
271
42
70 OF
vented to
116
18
232
36
60 OF
outside
106
17
212
33
50 OF
building
88
14
176
27
40 OF
70
11
140
22
FLUE ARRANGEMENT
The 80, 70 OF are intended for connection with 125mm (5 in) flue tube. The 60, 50 and 40 OF are
intended for connection with 100mm (4 in) flue tube.
For full information on flues refer to BS 5440, but the general requirements are as follows:
1) The flue should be kept as short and as warm as possible.
2) Give maximum possible vertical rise from the appliance before using any bends (preferably at
least 600mm (24 in)). Avoid the use of right angled bends.
Summary of Contents for BOSTON 40 OF
Page 9: ...fig 1 Pump in Casing Page 5 fig 2 Outer Case ...
Page 15: ...Page 8 Fig A One Zone Valve Fully Pumped System ...
Page 16: ...Fig B Sundial Gravity System ...
Page 17: ...Fig C 2 Zones Valve Fully Pumped System ...
Page 20: ...fig 7 Burner Controls fig 8 Boiler Thermostat Page 10 ...
Page 23: ...Fig 9 Insulation Combustion Box Door Fig 10 Baffle Securing Screws ...
Page 24: ...fig 11 Door Burner 60 50 40 fig 12 Door Burner 80 70 ...
Page 29: ...fig 16 Insulation Page 14 Short Parts List ...
Page 30: ......
