FireBird System Range Installation Servicing & Operating Instructions page 18

An adequate supply of combustion and ventilation air is essential for
efficient and safe boiler operation and the openings for this should be
positioned to cause least possible draught, with no possibility of being
Please note: The British Standard Code of Practice for Oil Firing BS5410:
of boiler rated output. (Note: 1kW = 3412 Btu/h).
Also, when the boiler is installed in a compartment or confined space,
ventilation openings are required to ventilate and to avoid overheating in
Combustion & Ventilation air supply for conventional
The figures shown are free areas of grilles in mm
Conventional open flue (a) or open flue low level discharge (b)
FULL TEXT of both BS 5410 Part 1: 1997 and appropriate Building

Regulations for each country should be obtained and fully applied
A. For boiler installations in domestic garages in Scotland, Part F of
Building Regulations permits only Room Sealed appliances to be used (Ref.
B. Technical annex T1/127 to OFTEC Book Three, May 1999 page 2
(19) Para. 1, 2 states "In Scotland and the Republic of Ireland only Room
Sealed Balanced Flue Appliances can be used in that

Combustion Air : Air required directly by boiler oil burner for combustion
Ventilation Air : Air required in room for ventilation, cooling, etc. and to
4
FLUE SYSTEMS
4-E Ventilation and Combustion Air
1. Conventional Flue Boilers
accidentally blocked.
Part 1, requires a permanent air inlet opening of
2
550mm per kW (above 5 kW)
the boiler area.
open flue boilers
N.B. Please Carefully Note:
OFTEC Bk. Three May 1999 page 1 (18).
location" (i.e. domestic garages).
Definitions
process.
promote a healthy living environment.
16
per kw of appliance rating (output).
2