Clearline AKC Instructions for use

1
Twin Wall Installation Instructions and
Maintenance Guide
Available in black powder coated as well as stainless.
Please read all instructions before beginning your
installation. Failure to install this system in accordance with
these instructions will invalidate the conditions of
certification and the manufacturer warranty.

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CONTENTS
PRODUCT IDENTIFICATION...................... Page 2
FUELS AND APPLIANCES .......................... Page 3
GENERAL INSTALLATION REGULATIONS...... Pages 3-5
DIAGRAMS FOR TYPICAL FLUE LAYOUTS...... Page 6
CLEARLINE AKC COMPONENTS ................ Pages 7-22
MAINTENANCE AND CHIMNEY CLEANING.... Page 23
OFFSET CHARTS........................................ Page 23
CHIMNEY HEIGHTS................................... Page 24-25
WARRANTY.............................................. Page 26
PRODUCT IDENTIFICATION
Clearline AKC Twin-Wall Chimney
Sizes:125mm to 200mm
Tested for compliance with BS EN1856-2
Product Designation: EN1856-2 T600-N1-W-V2-L50040 G(60)
For condensing appliances, with seals fitted:
Product Designation: EN1856-2 T200- P1-W-V2-L50040 0(20)
HETAS listed for use on approved solid fuels
Outer skin 304 grade stainless steel. Inner skin 316 grade stainless
steel. Rockwool 128kg per cubic metre, 25mm thick. All seams fully
welded. Distance to combustibles 60mm.
A COMMON CAUSE OF CHIMNEY RELATED FIRES IS THE FAILURE TO
MAINTAIN THE REQUIRED AIR GAP BETWEEN THE OUTER SURFACE OF
THE FLUE AND COMBUSTIBLE MATERIALS.
IT IS VITAL THAT THIS FLUE PIPE SHOULD BE INSTALLED WITH THE
CORRECT MINIMUM CLEARANCES AS SPECIFIED IN THESE
INSTRUCTIONS.

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FUELS AND APPLIANCES
CLEARLINE AKC conforms to BS EN1856-2 It is an all stainless steel
insulated chimney system designed to be used with solid fuel,
biomass, oil or gas, and with both condensing and non-condensing
boilers. Clearline AKC has been tested to have a working
temperature of 600°C. (200°C on condensing systems fitted with
seals). Chimneys installed in accordance with these instructions will
comply with British Standards.
Failure to follow the installation instructions could cause
FIRE, CARBON MONOXIDE POISONING, OR DEATH.
GENERAL INSTALLATION REGULATIONS
Chimney installation should be carried out by a competent person.
We recommend the use of HETAS approved installers for solid fuel
applications. If installation is carried out by a non HETAS registered
installer, the installation must be certified by a local Building Control
inspector. Planning permission may be required, and reference
should be made to the local Building Control Department.
VENTILATION
It is very important that sufficient air for combustion and ventilation
is provided to the room containing the appliance to enable correct
and efficient working of the appliance and chimney system.
CARBON MONOXIDE ALARMS
A carbon monoxide alarm must be provided in the room where the
solid fuel or gas appliance is located.

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All chimney installations should comply with Document J of
Building Regulations.
https://www.gov.uk/government/uploads/system/uploads/atta
chment_data/file/468872/ADJ_LOCKED.pdf
The Clearline AKC Chimney requires a 60mm clearance
to combustible material including timber joists, stud walls,
plasterboard and plywood. On condensing flue systems, where
seals are fitted, the clearance to combustible material is
reduced to 20mm.
Clearline AKC is an open-ended system, each component
secured with a locking band which is included with every
component that has a female connection.
There should be no more than 4 bends in a system. (A 90° Tee
on the back of the stove counts as 2 bends). If four bends are
used there should be sweeping access between the two offsets.
There should be no flue joins between a floor or ceiling joists or
rafters, with at least 150mm twin-wall flue projecting below
and above before an additional connection with twin wall.
The flue must not go more than 45° off vertical.
The minimum recommended height from top of stove to
termination is 4.5metres, however many stoves will run on a
shorter flue.
The minimum flue size for non defra approved stoves is
150mm.
The flue size must NEVER be smaller than the appliance outlet,
unless approved by stove manufacturer.
Flue needs to switch from single to double skin at 425mm
below a ceiling.
Where the chimney passes through any part of the building,
(with the exception of the room where the appliance is
installed), where there is a risk of accidental human contact, i.e
a bedroom etc., or where there is a risk of contact with
combustible materials, the chimney must be enclosed in an
appropriate way to meet Building Regulations. This can be
achieved by boxing-in the chimney, or by the use of a
protective wire mesh frame in roof spaces etc. The minimum
distance of 60mm to any combustible material, including loft
insulation should always be observed and any enclosure should
be ventilated using the appropriate ventilated fire stops.
Twin wall should also be boxed-in in attic spaces. This can be
achieved with wire mesh to a minimum of 1200mm in height.
Single skin flue should be 3 times its diameter from
combustible material if not heat shielded. (i.e. 150mm pipe
should be 450mm from combustible materials).

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It is recommended that the maximum offset should not
exceed 20% of the total height of the chimney.
All offsets should be supported above and below with the
appropriate support component i.e. ceiling, joist, wall or roof
support.
It is recommended that a vertical run of at least 600mm should
be allowed immediately above the appliance prior to any
change of direction.
To allow for expansion as the stove heats up, it is important
that the weight of the flue system is not carried by the
appliance. If the chimney is built from the stove upwards then
the flue lengths must be raised by 3-5mm before the supports
are fixed. A common practice would be to use small
combustible packers (eg. folded cardboard) placed in the flue
spigot to sit the first length or adaptor on. When the stove is lit
these will burn away while the fire-cement sets.
Twin wall lengths are designed to be assembled without the
use of any jointing compound.
If black twin wall flue is used straight off the stove then it is
important that the full length of the adaptor tail is recessed into
the flue spigot. This may require the adaptor tail to be cut
down.
NOTICE PLATE
The Notice plate for Clearline AKC should be marked up in indelible
ink and securely fixed in an unobtrusive but obvious position within
the building such as:
• Next to the electricity meter
• Next to the chimney installation
• Next to the water supply stop-cock

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Typical internal flue system Typical external flue system

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CLEARLINE AKC COMPONENTS
*** Denotes flue diameter ie: 200mm = 10-200-001,
50-200-001 for black powder coated.
Please be aware not ALL components are available in Black, such as
components that are normally concealed.
STARTING COMPONENTS
SW-TW ADAPTER Code:10-***-001
Tapered adaptor for connecting to traditional stoves with a flue collar, or going
from single skin to twin wall of the same diameter. Eg. 150mm single skin to
150mm twin wall. Working length 128mm.
SW-TW 100-125 INCREASING ADAPTER Code:10-100-002
Eg. 100mm single skin to 125mm twin wall.
SW-TW INCREASING ADAPTER Code:10-125-002
Eg. 125mm single skin to 150mm twin wall.
SW-TW FLAT ADAPTER Code: 10-***-005
Eg:for contemporary, European stoves, like Westfire, Opus, stoves without a
standard flue collar.

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SW-TW FLAT INCREASING ADAPTER Code:10-125-009
Eg: For connecting directly from 125mm outlet on European stove (without a
standard flue collar) to 150mm twin wall.
ADAPTER TO FLEX Code:10-***-099 
Used to convert from Twin wall insulated flue beneath, to flexible liner above.
Includes a locking band.
ADAPTER FROM FLEX Code:10-***-101
Used to convert from Flexible liner beneath, to Twin wall insulated flue above.

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FLUE LENGTHS
All flue lengths include a locking band.
1000MM LENGTH Code:10-***-010
Working length 957mm
500MM LENGTH Code:10-***-011
Working length 457mm
250MM LENGTH Code:10-***-012
Working length 207mm
100MM LENGTH Code:10-***-018
Working length 75mm
1000MM CONNECTING STARTER LENGTH Code:10-***-021
Working length 957mm – with integrated adaptor. This length allows the
Clearline Single Skin to socket up into the section by 325mm, then back down
to connect to the stove. This part allows the stove to be removed later without
dismantling the chimney system, so as to comply with building regulations.

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500-880MM ADJUSTABLE LENGTH Code:10-***-014
Adjustable lengths come with two locking bands – distance to combustibles
remains at 60mm, the same as all standard lengths.
Each adjustable length comes with an extra short length of rockwool which gets
compressed to ensure insulation continues throughout. Care must be taken to
ensure, when assembled to required length, no air gaps are left. There is a
high-temp plastic seal in the adjustable length locking band to avoid any
movement once length has been adjusted to required height. The locking band
fits onto the lower lip of the pipe.
350-500MM ADJUSTABLE LENGTH Code:10-***-015
250-350 ADJUSTABLE LENGTH Code:10-***-016
500MM TESTING LENGTH Code:10-***-019
Working length 457mm, including analysis port
PELLET GASKET Code:15-***-102
A rubber seal used on condensing installations to stop the condensates from
penetrating the flue. The Product Designation for Clearline AKC with seals fitted
for condensing appliances is: EN1856-2 T200-P1-W- V2-L50040(20)

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BENDS AND TEES
All elbows are fully welded on the inside and outside and come with a locking
band. Please note - Flue pipe elbows are measured in degrees from the vertical
plane. Roof pitches are also measured in degrees, but from the horizontal
plane. ie, a 30 degree flue elbow will not follow a 30 degree roof pitch.
135 DEGREE TEE Code:10-***-034

Used when exiting a wall at 45 degrees, giving you sweeping access to the
external part of the flue system.
Cap has to be ordered separately. Two locking bands are included.
90 DEGREE TEE Code:10-***-035

When using rear outlet on a stove. Tee Cap has to be ordered separately.
TEECAP Code:15-***-036
Used with 90 Degree and 135 Degree Tees

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TEE CAP WITH DRAIN Code:15-***-037
Used with 90 Degree and 135 Degree Tees for condensing systems or with an
open terminal.
45 DEGREE BEND Code:10-***-031
30 DEGREE BEND Code:10-***-032
15 DEGREE BEND Code:10-***-033

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SUPPORTING COMPONENTS
Clearline AKC Twin Wall can extend 1.5metres above the roof without
extra support.
JOIST SUPPORT Code:15-***-068

Flue support used on horizontal joists or timbers when passing into a cold roof.
It can be used on the floor in a loft to replace second ventilated ceiling support.
ROOF SUPPORT Code:15-***-067
This supports the flue as it passes roof rafters, pivoting to meet any roof pitch.
50-80MM WALL BAND Code:15-***-051
Provides lateral support, to be used every 1500 -2500mm

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80-130MM WALL BAND Code:15-***-052
Provides lateral support, to be used every 1500 -2500mm
130-210MM WALL BAND Code:15-***-053
Provides lateral support, to be used every 1500 -2500mm
210-420MM WALL BAND Code:15-***-055
Provides lateral support, to be used every 1500 -2500mm. This is ideal for an
offset round a gutter.
CORNER WALL BAND 270-520MM
For corner installations to replace a standard wall band giving a balanced look.

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STRUCTURAL LOCKING BAND Code:15-***-054
Increases the maximum un-supported height of the flue from 1.5m to 2.5m.
One should be used on the joint below the roof support, and one on each joint
above the roof, except the termination, replacing the standard locking band.
FLOOR SUPPORT BAND/GUY WIRE BRACKET Code:15-***-069
The Floor Support Band sits on top of the upper ventilated ceiling support.
The Guy Wire bracket is used where there are guy wire attachment points on
three sides, otherwise a roof brace kit should be used.
ADJUSTABLE WALL SUPPORT BRACKET 50-80MM Code:15-***-060
Used for external systems supporting up to 20metres of flue. Incorporates a
200mm flue length. This part supports the chimney up to 12metres above and
8metres below. Wall bands are required at 1.5 -2.5metre intervals, as the
situation requires.

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ADJUSTABLE WALL SUPPORT BRACKET 80-280MM Code:15-***-063
Used for external systems supporting up to 20metres of flue. Incorporates a
200mm flue length. This part supports the chimney up to 12metres above and
8metres below. Wall bands are required at 1.5 -2.5metre intervals, as the
situation requires.
TRUNCATED STACK PLATE Code:10-***-062
Used for truncated systems, changing from a flexible liner inside a masonry
chimney to Clearline AKC twin wall insulated flue above. Holes already drilled in
each corner for fixing the plate down. The flexible liner connection utilises the
screw fitting detail.
ROOFBRACEKIT Code:RBK
A roof brace can be used whenever there is need to stabilise the chimney above
roof level. Not available in black.

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PENETRATION COMPONENTS
SOLID FIRESTOP PLATE Code:10-***-070
Mainly used in gas or oil installations. For solid fuel installations, can only be
used to go through a floor in a single storey building into a non-habitable cold
loft space.
WHITE VENTILATED FIRESTOP PLATE Code:10-***-073
Used when penetrating a ceiling or floor in a domestic installation. Usually used
in conjunction with the Firestop Cover Plate. The pair of Ventilated Firestop
Plates can support 3metres of flue above the ceiling, and 1.5metres below.
WHITE FIRESTOP COVER PLATE Code:15-***-075
This is powder coated to match white ceilings, used to cover existing Ventilated
Firestop Plate still allowing enough free air around the flue and the boxing in
above. The plate includes magnets and spacers to ensure enough free air
movement.

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WIDE ROUND FINISHING PLATE 0-30° Code:15-***-118
150mm wide. Covers any gap to combustibles or making good around flue as it
passes through ceilings or walls.
WIDE ROUND FINISHING PLATE 30-45° Code: 15-***-116
150mm wide. Covers any gap to combustibles or making good around flue as it
passes through walls or pitched ceilings or walls.
WALL SLEEVE 45 DEGREE Code:15-***-100
Used when going through a wall at 45 degree angle.

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FLASHINGS
Traditional lead, nu-lead and aluminium flashings for tiled roofs, and EPDM
flashings for flat and profiled roofs – we have a full range of sizes available.
Please see website for details.
STORM COLLAR Code:15-***-082
Provides a skirt to deflect moisture, positioned an inch or so above the flashing.
When fitting, a bead of silicone should be used round the top to seal.
TERMINATIONS
RAINCAP Code:15-***-090
Must be used to prevent rain ingress. Includes a locking band.

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ANTI -DOWNDRAUGHT COWL Code:15-***-091
Includes a locking band.
SPINNING COWL Code:15-***-094
Regular maintenance is required for this type of cowl.
CONE TOP COWL Code:15-***-093
GASCOWL Code:15-***-092
For gas systems only
INSULATION COVER PLATE Code:15-***-104
Used to close off a flue system to cover any exposed insulation
material. Can be used when using a generic cowl or when no rain cap is
required.