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VENTILATION REQUIREMENTS OF COMMERCIAL BOILERS OVER 70KW NET INPUT
ROOM SEALED APPLIANCES, TYPE C IN PLANT ROOMS
OPEN FLUED APPLIANCES, TYPE B IN PLANT ROOMS
(ADDITIONAL RECOMMENDATIONS)
OPEN FLUED APPLIANCES, TYPE C IN PLANT ROOMS
(ADDITIONAL RECOMMENDATIONS)
FLUE TYPE
VENTILATION DIRECT TO OUTSIDE AIR
(cm
²
per kW net heat input)
HIGH
LOW
(TYPE C)
2
2
Natural Ventilation cm
²
kw (net) heat input for open flue boilers located in a boiler house
(A) Boiler House
(B) Enclosure
Summer usage*
greater than 50% up
to 75%
Summer usage*
greater than 75%
up to 100%
High
2
5
+1
+2
Low
4
10
+1
+2
*for boilers in use for more than 50% of the time during the summer months, additional ventilation needs to be
added to those in columns A and B
Natural Ventilation cm
²
kw (net) heat input for open flue boilers located in a boiler house
(A) Boiler House
(B) Enclosure
Summer usage* greater
than 50% up to 75%
Summer usage* greater
than 75% up to 100%
To a room
or internal
space
Direct to
outside air
High
2
10
5
+1
+2
Low
2
10
5
+1
+2
*for boilers in use for more than 50% of the time during the summer months, additional ventilation needs to be
added to those in columns A and B
For further information, please refer to:
• Manufacturer’s instructions
• IGEM UP10
• BS6644
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idealheating.com
Minimum Quantity of Mechanical Ventilation
Mechanical ventilation m
³
/hr per kW net heat input
(A) Min
inlet air
m
³
/hr
(B) Difference
between inlet and
extract air
†
m
³
/hr
Summer usage
††
greater than 50%
up to 75%
Summer usage
††
greater than 75%
up to 100%
Boiler(s) with draught diverter
2.8
2.07 ±0.18
+0.72
+1.44
Boiler(s) without draught diverter†††
2.6
1.35 ±0.18
+0.72
+1.44
†inlet air minus ventilation 2.8 - 2.07 = 0.73m
³
/hr
††For boilers in use for more than 50% of the time during the summer months, additional mechanical ventilation needs to be
added to those columns A and B
††† with or without draught stabilisers
• High level ventilation openings shall be located as high as is reasonably practicable and preferably within 15% of
the building height from the ceiling.
• Low level ventilation openings shall be within 1m of the floor for Natural Gas and within 250mm of the floor for
LPG.
• For LPG it is preferable that low level ventilation openings are located at floor level.
• Ventilation to an internal space is not generally recommended unless a Risk Assessment has been completed.
• The air supplied for boiler room ventilation shall be such that the maximum temperature within the boiler
house is:
• 25˚C at floor level (or 100mm above floor level)
• 32˚C at mid level (1.5 m above floor level)
• 40˚C at ceiling level (or 100mm below ceiling level)
MECHANICAL VENTILATION
• Mechanical ventilation can be a combination of mechanical inlet and outlet or mechanical inlet and natural
ventilation outlet.
• The fans shall be selected and controlled so as to not cause a negative pressure (relative to the outside
atmosphere) developing in the boiler room.
• Interlocked to the gas appliance.
IMPORTANT
The application of any other treatment to this product may
render the guarantee of Ideal Heating invalid.
Ideal Heating recommend Water Treatment in accordance
with the Benchmark Guidance Notes on Water Treatment in
Central Heating Systems.
If water treatment is used Ideal Heating recommend only the
use of Scalemaster Gold 100, Fernox, MB-1, Adey MC1,
Sentinel-X100, CALMAG CM100 inhibitors and associated
water treatment products, which must be used in accordance
with the manufacturers’ instructions.
NOTES
1.
It is most important that the correct concentration of the
water treatment products is maintained in accordance with
the manufacturers’ instructions.
2.
If the boiler is installed in an existing system any unsuitable
additives MUST be removed by thorough cleansing. BS
7593:2006 details the steps necessary to clean a domestic
heating system.
3.
In hard water areas, treatment to prevent lime scale may
be necessary - however the use of artificially softened water is
NOT permitted.
4.
Under no circumstances should the boiler be fired before
the system has been thoroughly flushed.
Fernox Alent plc
Forsyth Road, Sheerwater, Woking,
Surrey GU21 5RZ
Tel: +44 (0) 870 601 5000
Sentinel Performance Solutions
7560 Daresbury Park
Daresbury, Warrington
Cheshire
WA4 4BS
Tel: 0800 389 4670
www.sentinelprotects.com
Scalemaster Water
Treatment Products
Emerald Way, Stone, Staffordshire
ST15 0SR
Tel: 01785 811636
Calmag Ltd.
Riverview Buildings
Bradford Road, Riddlesden,
Keighley, West Yorkshire
BD20 5JH
Tel: +44 (0) 1535 210 320
Adey Innovation Ltd
Unit 2, St Modwen Park,
Haresfield,
Stonehouse GL10 3EX
Tel: +44 (0) 1242 546700
FOR FURTHER INFORMATION CONTACT:
WATER TREATMENT
