© MHG Heating Ltd
36
MHG Heating Ltd Unit 4 Epsom Downs Metro Centre, Waterfield, Tadworth, Surrey KT20 5LR
Telephone 08456 448802 Fax 08456 448803 Email info@mhgheating.co.uk Web www.mhgheating.co.uk
020315 Draft
Air Supply, Ventilation and Balance Flue Terminal Positioning Quick Reference Guide for;
BS 5440-1:2008, BS 5440-2:2009, BS 6644:2011 & IGE/UP/10 (ed3)
BS5440-2:2009. Installation and maintenance of flue and ventilation for gas appliances of rated input
not exceeding 70 kW net (1
st
2
nd
& 3
rd
family gases)
Open Flued Appliances Installed within a Room (Natural ventilation requirements direct to Outside Air)
Total rated net input not in excess of (70 kW – 7 kW) x 5cm
2
= Ventilation opening free area
Open Flued Appliances Installed within a compartment (Natural ventilation requirements)
Ventilation route
Grille Location
Ventilation to room or internal space
(The internal space ventilated into must be ventilated as detailed
above to outside air)
Ventilation direct to outside air
High Level (Free Area/kW)
Balanced Flued Appliances Installed within an Enclosure (Natural ventilation requirements)
Ventilation route
Grille Location
Ventilation to room or internal space
Ventilation direct to outside air
High Level (Free Area/kW)
Document Intended for quick guidance only. Absolute guidance must be sought from BS5440 2:2009 directly
For BS 6644 and IGE UP 10 Installations the ventilation openings might need to be increased if the following air temperatures are exceeded. (@15
0
C Ambient)
High-Level (100mm Below Ceiling Level)
Mid-level (1500mm Flow Floor Level)
Low-Level (100mm Above Floor Level)
As a guide, reduction of air temperature may be achieved by increasing the inlet and outlet air supply by 0.15 m
3
/h or 0.2 cm
2
/kW of net heat input per
0
C of temperature reduction required
BS6644:2011 Specification for the Installation of gas-fired hot water boilers of rated inputs between
70 kW (net) and 1.8 MW (net) (2
nd
and 3
rd
family gases)
Open Flued Appliances Installed within an Enclosure (Natural ventilation requirements direct to Outside Air)
System Type &
Operational Time
Grille Location
Heating &/or HWS Operation
< 50% time operation during
summer months
Heating &/or HWS Operation
> 50% < 75% time operation
during summer months
Heating &/or HWS Operation
> 75% time operation during
summer months
High Level (Free Area/kW)
Open Flued Appliances Installed within a Boiler Room (Natural ventilation requirements direct to Outside Air)
System Type &
Operational Time
Grille Location
Heating &/or HWS Operation
< 50% time operation during
summer months (Biomass/Solid Fuel
Boiler Additional Free Area)
Heating &/or HWS Operation
> 50% < 75% time operation
during summer months
(Biomass/Solid Fuel Boiler Additional Free Area)
Heating &/or HWS Operation
> 75% time operation during
summer months
(Biomass/Solid Fuel Boiler Additional Free
Area)
High Level (Free Area/kW)
Balanced Flued Appliances Installed within an Enclosure (Natural ventilation requirements direct to Outside Air)
System Type &
Operational Time
Grille Location
Heating &/or HWS Operation
< 50% time operation during
summer months
Heating &/or HWS Operation
> 50% < 75% time operation
during summer months
Heating &/or HWS Operation
> 75% time operation during
summer months
High Level (Free Area/kW)
(57 pages)
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