© MHG Heating Ltd
37
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
Balanced Flued Appliances Installed within an Enclosure (Natural ventilation requirements to a room or internal space)
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)
Balanced 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
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)
Document Intended for quick guidance only. Absolute guidance must be sought from BS6644 : 2011 directly.
Open Flued Appliances Installed with a Draught Diverter
(Mechanical ventilation flow rate 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 Extract
(Difference Between Inlet and Extract Air)
Open Flued Appliances Installed without a Draught Diverter (With or without stabilizers)
(Mechanical ventilation flow rate 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 Extract
(Difference Between Inlet and Extract Air)
Where high level/discharge openings are not mechanically assisted, the free area must be calculated as detailed above
(Open Flued Appliances Installed within a Boiler Room (Natural ventilation requirements direct to Outside Air)
All air inlet and extract fans must be fitted with automatic controls (interlocks) causing safety shut-down or lockout of
the installed gas burning appliances in the event of an inlet or extract air flow failure
Document Intended for quick guidance only. Absolute guidance must be sought from BS6644:2011 directly
(57 pages)
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comments to this Manuals