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Minimum Flue Terminal Clearance Distances

Minimum Clearance Distances (Flue Terminal Outlet)


The following diagram and relatied chart are broadly based around BS5440:Part 1:2000. For additional comments/applications please refer to this BSI standard directly.

Minimum dimensions of flue terminal positions

 

Terminal position

Balance flues

room sealed

Open flues

Natural

draught

Fanned

draught

Natural

draught

Fanned draught

A

* Directly below an opening, airbrick, window etc.

0-7kW

>7-14kW

>14-32kW

>32-70kW

300 mm

600 mm

1500 mm

2000 mm

300 mm

Not allowed

300 mm

B

* Above an opening, airbrick, window etc.

0-7kW

>7-14kW

>14-32kW

>32-70kW

300 mm

300 mm

300 mm

300 mm

300 mm

Not allowed

300 mm

C

* Horizontally to an opening, airbrick, window etc.

0-7kW

>7-14kW

>14-32kW

>32-70kW

300 mm

400 mm

600 mm

600 mm

300 mm

Not allowed

300 mm

D

Below a gutter or sanitary pipe if combustible material protected.

 

300 mm

75 mm

Not allowed

75 mm

E

Below eaves.

 

300 mm

200 mm

Not allowed

200 mm

F

Below balconies or open roofed out buildings.

 

600 mm

200 mm

Not allowed

200 mm

G

From a vertical drain or soil pipe.

 

300 mm

150 mm

Not allowed

150 mm

H

From an internal or external corner.

 

600 mm

300 mm

Not allowed

200 mm

I

Above ground or balcony level.

 

300 mm

300 mm

Not allowed

300 mm

J

From a surface facing the terminal.

 

600 mm

600 mm

N/A

600 mm

K

From another terminal facing the terminal.

 

600 mm

1200 mm

N/A

1200 mm

L

From an opening in the car port into a dwelling.

 

1200 mm

1200 mm

N/A

1200 mm

M

Vertically from a terminal on the same wall.

 

1500 mm

1500 mm

N/A

1500 mm

N

Horizontally from a terminal on the same wall.

 

300 mm

300 mm

N/A

300 mm

O

From a wall on which the terminal is mounted.

 

N/A

N/A

N/A

50 mm

P

From a vertical structure on the roof.

 

N/A

N/A

600 mm

N/A

Q

Above intersection with roof.

 

N/A

N/A

600 mm

150 mm

Notes: N/A = NOT APPLICAIABLE * In addition, the terminal should not be nearer than 150mm (fan draught) or 300mm (natural draught) to an opening in the building fabric formed for the purpose of accommodating a built-in element such as a window frame. Separation distances are linked to the rated heat inputs as shown.


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BS5440.pdf

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Approved Comments...
clear & concise Approved: 28/07/2014
Spot on Approved: 19/06/2014
The diagram was extremely helpful. Thank You! Ross Approved: 30/01/2012
Took some time to find the site with the information I reguired.Yours is spot on. Thank you Donal Approved: 10/02/2011
Last Modified on 15/05/2006.
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