Bosch Appliances 18/25, 25/32kW, 12/18 Cabinet Mounted LOW Level Flue Terminal Positions

Minimum dimensions of flue terminal positions for oil fired appliances:

TERMINAL POSITION		B(H)
A 1	Directly below an opening, air brick, opening windows, etc	600mm
B 1	Horizontally to an opening, air brick, opening window, etc	600mm
C Below a plastic/painted gutter, drainage pipe or eaves if		75mm
	combustible material protected
D 2	Below a plastic/painted gutter, drainage pipe or eaves without	600mm
	protection to combustible material
E	From vertical sanitary pipework	300mm
F	From an external or internal corner or from a surface or boundry	300mm
	alongside the terminal
G	Above ground or balcony level	300mm*
H 1	From a surface or boundary facing the terminal with 2500mm	1200mm
	clearance to both sides of the terminal
H 2	From a surface or boundary facing the terminal with less than	2500mm
	2500mm clearance to either side of the terminal
I 1	From a terminal facing the terminal with 2500mm clearance to	1200mm
	clearance to both sides of the terminal
I 2	From a terminal facing the terminal with less than 2500mm	2500mm
	clearance to either side of the terminal
K	Horizontally from a terminal	750mm

CABINET MOUNTED LOW LEVEL

FLUE TERMINAL POSITIONS

•	Flue terminals must be positioned to avoid
	combustion products entering into buildings.
•	The flue must be fitted and terminated in
	accordance with the recommendations of
	BS5410.
•	The flue must not cause an obstruction.
•	Discharge from the flue outlet must not be a
	nuisance.
•	Flue gases have a tendency to plume and in
	certain weather conditions a white plume of
	condensation will be discharged from the flue
	outlet which could be regarded as a
	nuisance, for example, near security lighting.
•	There should be no restriction preventing the	-PRE	INSTALLATION
	clearance of combustion products from the
	terminal.
•	The air inlet/outlet duct and the terminal of
	the boiler must not be closer than 25mm to
	any combustible material. Detailed
	recommendations on protection of
	combustible materials are given in BS 5410:1
•	A protective terminal guard must be fitted if
	the terminal is 2m or less above a surface
	where people have access.
	Stainless steel terminal guard.
	Part No: 7 716 190 050

B(H) Balanced Horizontal flue

1An opening means an openable element, such as an openable window, or a permanent opening such as a permanently open air vent.

Notwithstanding the dimensions above, a terminal should be at least 300mm from combustible material, e.g. a window frame.

2A way of providing protection of combustible material would be to fit a heat shield at least 750mm wide.

•The following additional guidelines (from part L Exceptions Guidance Document) are recommended when determining the flue outlet position:

•Avoid discharging flue gases into car ports or narrow passageways.

•*Minimum distance of the flue terminal from above ground is 2100mm where directed to a public footpath, private access route or a frequently used area and 2500mm from a car parking area.

boundary

F

I

H

boundary

C, D

A B

E F

G

J

F

K

INSTALLATION & SERVICING INSTRUCTIONS FOR WORCESTER GREENSTAR HEATSLAVE EXTERNAL 12/18-18/25-25/32 8 716 113 389b (09/07)

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CABINET MOUNTED LOW LEVEL

FLUE TERMINAL POSITIONS