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Location of outlets from flues serving gas appliances


Location of outlets from flues serving gas appliances
The correct positioning of gas flue outlets are important if the flue is to work properly.

gas flue outlet postions


DistanceLocationMinimum separation distances for terminals (mm)
Balanced flueOpen flue
Natural draughtFanned draughtNatural draughtFanned draught
ABelow an opening (1)Appliance rated
heat input (net)
0 – 7 kW:
>7 – 14 kW:
>14 to 32 kW:
> 32kW:


300
600
1500
2000

300Not to be used300
BAbove an opening (1)0 – 32 kW:
>32kW:
300
600
300Not to be used300
CHorizontally to an opening (1)0 – 7 kW:
>7 – 14kW:
> 14kW:
300
400
600
300
Not to be used300
DBelow gutters, soil pipes or drains.30075Not to be used75
EBelow eaves300200Not to be used200
FBelow balcony or car park roof600200Not to be used200
GFrom a vertical drain or soil pipe300150 (3)Not to be used150
HFrom an internal or external corner
or to a boundary alongside the
terminal (2)
600300Not to be used200
IAbove ground, roof or balcony
level
300300Not to be used300
JAbove ground, roof or balcony
level
600600Not to be used600
KFrom a terminal facing the terminal6001200Not to be used1200
LFrom an opening in the car port
into a building
12001200Not to be used1200
MVertically from a terminal on the
same wall
15001500Not to be used1500
NHorizontally from a terminal on the
same wall
300300Not to be used300
OFrom the wall on which the
terminal is mounted
Not applicableNot applicableNot applicable50
PFrom a vertical structure on the
roof
Not applicableNot applicable1500 if a ridge
terminal. For any
other terminal as
per BE 5440 – 1:
2000
Not applicable
QAbove the highest point of
intersection with the roof
Not applicableSite in
accordance with
manufacturers
instructions
Site in accordance
with BS 5440 – 1:
2000
150
  1. An opening here means an openable element, such as an openable window, or a fixed opening such as a vent. However, in addition, the outlet shall not be nearer than 150 mm (fanned draught) or 300 mm (natural draught) to an opening into the building fabric formed for the purpose of accommodating a built in element, such as a window frame.
  2. Smaller separations to the boundary may be acceptable for appliances that have been shown to operate safely with such separations from surfaces adjacent to or opposite the flue outlet.
  3. This dimension may be reduced to 75 mm for an appliance with an input (net) not greater than 5 kW.

Location of outlets near roof windows or openings (from flues serving gas appliances)

gas flue outlet at roof level

Please check with your local building control department before using information contained in this page to ensure that they comply with your local building codes.

 


Thinking of home improvments:
Call us on the number below or email us at info@carryduffdesigns.co.uk
We provide architectural services for projects within and around the following areas: All of Belfast, Newtownards, Bangor, Ards Peninsula, Comber, Ballynahinch, Downpatrick, Lisburn, Banbridge, Craigavon, Portadown, Newtownabbey and Carrickfergus.
 
   
Carryduff Designs 1 Thorndale Road North, Carryduff, Belfast. Tel: 028 90814106