Baxi Potterton LPG Service Manual download pdf (Page 19)

8.0 Flue Options

Vertical

Flues

Vertical

Flues

(Twin Pipe)

8.2 Twin & Vertical Flue Systems

1. Maximum permissible equivalent flue lengths are:-

(60/100) (80/125)

Vertical Concentric 10 metres 20 metres

Vertical Twin Pipe 15 metres

2. Any additional “in line” bends in the flue system must be

taken into consideration.

Their equivalent lengths are:-

Concentric Pipes:

135° bend 0.5 metres

93° bend 1.0 metres

Twin Flue Pipe

135° bend 0.25 metres

91.5° bend 0.50 metres

The elbow supplied with the standard horizontal telescopic

flue kit is not included in any equivalent length calculations

NOTE: Flue length is measured from point X to Y as

shown.

The total equivalent length for this example is

= 6.5 metres.

1m extension

45°bend

91.5°bend

0.25m

0.5m

5.0m

0.5m

1.0m

AIR DUCT

fittings/pipes

Sub total

Equivalent

Length Value

Equivalent Length Air Duct = 6.5m

1m extension

45°bend

91.5°bend

0.25m

0.5m

5.0m

0.5m

1.0m

FLUE DUCT

fittings/pipes

Sub total

Equivalent

Length Value

Equivalent Length Flue Duct = 6.5m

Roof

Terminal

660mm

This bend is equivalent to

1 metre

Total Equivalent Length =

A+B+C+1x90°Bend

All vertical and angled runs must be included,

measured from the boiler adaptor (point X) to the

joint with the flue terminal (point Y). One 91.5°

bend or two 45° bends can be included without

reduction of the flue length.

If further elbows are required the flue length must

be reduced by the following amounts:-

1 metre for each 91.5° elbow

0.5 metre for each 45° elbow

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 55 56

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Baxi Potterton LPG Service Manual Page 19

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