2.8 DETERMINING THE FLUE LENGTH AND FLUE PACKS REQUIRED
IMPORTANT. The boiler must be installed in a vertical position in accordance to the installation instructions.
FLUE KITS
Telescopic Flue‘B’ Pack - contains: Flue turret, telescopic ue incorporating a terminal, rubber wall seal and instructions
Horizontal Flue Terminal (600mm long) ‘B’ Pack - contains: Flue turret, non telescopic single piece ue incorporating a
terminal, rubber wall seal and instructions.
Horizontal Flue Terminal (1000mm long) ‘B’ Pack - Flue turret, telescopic ue incorporating a terminal, rubber wall seal and instructions.
Note. If ‘B’ packs are used on their own (either 1 piece or telescopic), then they can be tted horizontally as the ue inside is
designed to slope 1.5 degrees.
‘D’ Pack - contains: 1 metre length of ue pipe (Functional length 950mm), 1 support bracket and instructions.
When extension ‘D’ Packs are used the ue duct must incline 1.5 degrees away from the appliance, to allow the condensate to drain
back to the boiler and out of the condensate drain. It is recommended that a support bracket is tted on every 1 metre of pipe work
used and the bracket is located as close to the collar as possible. The bracketing must ensure a 1.5 degree fall back to the appliance.
Optional Flue Finishing Kit - UIN 155988 & Concentric Flue Screw Retaining Kit (Optional Kit of mechanical xing of ue joints)
Only use water as a lubricant during assembly.
The ‘B’ pack terminal is classed as part of the maximum ue length.
This ue system incorporates a removable ue outlet nose that utilises a push t location system. This enables the installation of
deector, high level or balcony ue kits without the removal of the whole ‘B’ pack terminal. The appliance must not be operated
without the desired outlet nose correctly tted in place, ensuring the side location dimples are in line with the mounting face
allowing the correct sealing of the components.
It is IMPORTANT that all attachments are tted in accordance to the installation instructions provided with them.
The TURRET supplied in the ‘B’ Pack has an upper combustion sample point with a screw cap seal and a lower air sample point
with an air stopper seal. Ensure all caps & seals are in place.
Additional Termination Kits available for use with these ‘B’ packs.
Flue Deector Kit The resistance is the equivalent of 1 metre of ue pipe and therefore must be deducted from
any maximum ue length
High Level Flue Outlet Kit
The maximum permissible concentric ue length when using a standard (500mm) kit is 4.5 metres
Balcony Flue Outlet Kit The maximum permissible concentric ue length when using this kit is dependant on the length
of the balcony ue outlet run which combined with the concentric run must not exceed the
maximum ue length requirement of the appliance it is to be tted to
Total Maximum Permissible Horizontal Concentric Flue Length combining both ‘B’ Packs and ‘D’ Packs
(Measured from centreline of the turret to the outside of the wall terminal)
15, 18 & 26 kW appliances Total Maximum: 10 metres - minus any ue kit options or bends
32kW Appliances Total Maximum: 8 metres - minus any ue kit options or bends
Total Maximum permissible Vertical Flue Length combining both Roof Terminal and ‘D’ Packs
15, 18, 26 & 32kW Appliances Total Maximum: 10 Metres - minus any bends
90º Elbow Kit 60/100 - (Equivalent ue length resistance = 1M)
45º Elbow Kit 60/100 - (Equivalent ue length resistance = 0.6M)
Minimum Horizontal Flue Lengths (Centre line of turret to outside of wall terminal)
Telescopic terminal = 350mm
One piece terminal = 285mm
Wall Thickness Std Metric Brick 102.5mm wide
‘B’ Pack Flue Type Minimum permissible Wall Thickness Maximum permissible Wall Thickness
Rear Flue Rear Flue + Std-Off Side Flue Rear Flue Rear Flue + Std-Off Side Flue
Horizontal Flue Terminal
(600mm long) B Pack
154 102.5 102.5 527 482 433
Telescopic Flue B Pack 265 220 171 478 433 384
Horizontal Flue Terminal
(1000mm long) B Pack
577 532 483 704 749 700
Horizontal Flue Terminal
(1000mm long) B Pack cut 75mm
502 457 498 719 674 625
For Flue lengths between 658 & 708 use a Horizontal Flue Terminal (1000mm long) B Pack, cut 75mm off the end of the
terminal section of the telescopic ue only.
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