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Plume management system
Effective flue lengths versus plume management lengths
The graph for the appliances listed below detail the effective flue lengths
versus plume management lengths, for all other appliances the details
are in the Flue sections of the appliance Installation and maintenance
instructions.
The lengths for both plume and flue are the effective lengths, which
includes the effective length of any elbows plus the straight lengths.
Appliances covered
▶ For the CDi range of appliances including British Gas variants, the
available plume length [M] is reduced as the flue length [L] increases.
▶ The Si, i System, i Junior and Ri can use up to 4,500mm of plume
management regardless of flue length.
▶ Any flue must have a minimum of 500mm plume length.
The graph can be used to calculate:
• Effective flue length [L] if a specific effective plume length is
required.
• Effective plume length [M] if a specific effective flue length is
required.
L
(mm)
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
0
500
1,500
Fig. 40 Effective flue lengths versus plume management lengths
[L]
Effective flue length
[M]
Plume management length allowed
Appliance
1
Greenstar 27CDi
2
Greenstar Si, i Junior, i System & Ri
3
BG430/i, Greenstar 30CDi Regular, System, 29CDi ErP, 30CDi
Regular ErP & 30CDi System ErP
4
Greenstar 30CDi, 34CDi Erp & 35CDi System ErP
5
BG532/i
6
BG537/i & Greenstar 37CDi
7
BG542/i Greenstar 42CDi, 40CDi Regular, 40CDi Regular ErP,
38CDi ErP & 42CDi ErP
Table 6 Appliances effective flue lengths versus plume management
lengths
18
Max M 4,500mm
2,500
3,500
4,500
M (mm)
0010013693-001
5.3.1
Plume management length
Plume management length (M) is calculated from the centre of the
terminal, along the required route to the centre of the plume outlet.
Fig. 41 Plume management length M
Minimum plume extension length
The minimum extension length between two elbows/offsets is 140mm,
this allows for a good seal at the connection joints,
Also remember when fitting the extension tube into elbows/extension
fully into the outlet assembly [2], then withdraw the tube approximately
10mm to allow for expansion
1
2
3
4
5
6
7
Fig. 42
5.3.2
Plume management elbows
Adding additional elbows to the standard plume management kit system
reduces the actual plume management length. Each elbow has an
equivalent straight length and must be factored into the overall effective
length.
• 90° elbow is equivalent to 1,500mm.
• 45° elbow is equivalent to 750mm.
Fig. 43 Plume management 90° elbows offset example
0010013556-001
0010013714-001
0010013557-001
Greenstar Condensfit II – 6 720 874 391 (2019/04)
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