Firebird Condensing Boiler
4
17
4.3 - VENT REQUIREMENTS
Ventilation and Combustion Air
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: NFPA Code of Practice for Oil Firing, requires a permanent air inlet opening of 4 sq” per
3413 BTU/HR (above 17060 BTU/HR) of boiler rated output is needed.
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.
Combustion & Ventilation air supply for conventional
open flue boilers in a confined space.
The figures shown are free areas of grilles in inch
2
Regulations Clearances found in NFPA #1
Please Carefully Note:
A. Most boiler installations in garages are not permitted
B. Check VL 4 NFPA
Definitions
Combustion Air : Air required directly by boiler oil burner for combustion process.
Ventilation Air : Air required in room for ventilation, cooling, etc. and to promote a healthy
living environment.
Unconfined Space : Any space whose volume is equal to or greater than 50 cu. ft. per 1000
BTU/HR of the aggregate input rating of all fuel-burning appliances installed
therein.
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