FireBird Enviromax Popular C20 Technical Manual page 49

6 6.4 - FLUES REGULATIONS
Conventional Flue Boilers
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 accidentally blocked.
Please note: The British Standard Code of Practice for Oil Firing BS5410: Part 1, requires a permanent air
inlet opening of 550mm
Also, when the boiler is installed in a compartment or confined space, ventilation openings are
required to ventilate and to avoid overheating in the boiler area.
The figures shown are free areas of grilles in mm

A. For boiler installations in domestic garages in Scotland, Part F of Building Regulations permits only
Room Sealed appliances to be used (Ref. OFTEC Bk. Three May 1999 page 1 (18).
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 location"
(i.e. domestic garages).

Combustion Air :
Ventilation Air :
Ventilation and Combustion Air
2 per kW (above 5 kW) of boiler rated output. (Note: 1kW = 3412 Btu/h).
Combustion & Ventilation air supply for conventional
open flue boilers
FULL TEXT of both BS 5410 Part 1: 1997 and appropriate Building
Regulations for each country should be obtained and fully applied
N.B. Please Carefully Note:
Air required directly by boiler oil burner for combustion process.
Air required in room for ventilation, cooling, etc. and to promote a healthy living
environment.
2 per kw of appliance rating (output).
Definitions
47
Firebird Enviromax Condensing Range