QSW 316 is a quality single wall connecting flue system designed and approved for use with all fuels including gas, oil, wood and approved solid fuels.

1. Customer Service
The Docherty Group directly employs a team of dedicated
sales professionals, all comprehensively trained to exacting
standards and offering the very best pre-sales technical and
practical support for our industry customers.
We always deliver the products our customers want - when
they want them - and, with an unrivalled branch network,
we’re never too far away!
Quality
We operate a Quality Management System with
accreditation to European Standard ISO 9001:2008.
We’re the leading independent UK manufacturer and
distributor of flue and chimney systems and renewable fuel
appliances.
With over 50 years experience, our name is synonymous
with consistent quality, reliable supply and excellent
customer care, delivered through a network of our own
branches and accredited dealers.
The Group also offers specialist HETAS approved training
courses for installers from a purpose-built facility.
Complete capability
from the Docherty Group
QSW 316 is a quality single wall
connecting flue system designed
and approved for use with all
fuels including gas, oil, wood and
approved solid fuels.
QSW316
2
Approval
Manufactured and approved to
BS EN 1856-2 with designation
T450 N2 D 3 G, QSW 316 is also
approved by HETAS, the official body
recognised by Government to approve
biomass and solid fuel domestic heating
appliances, fuels and services.
Dimensions and
Components
QSW 316 is available in a comprehensive
range of diameters suiting all applications
from 127mm to 254mm.
A wide range of components including
lengths, elbows, tees, adaptors and
fittings are available to offer a complete
connecting flue system that complements
any residential or commercial installation.
Construction
Manufactured in the UK to exacting
standards under a Quality Management
System accredited to European Standard
ISO 9001:2008.
The components are constructed with a
male spigot end and a female socket end
to provide simple and rapid installation.
QSW 316 is designed to be installed with
the socket end facing upwards, the spigot
end facing downwards.
Material Specification
and Warranty
QSW 316 is supplied with a two year
warranty and is manufactured from
1mm high grade 316 stainless steel.
It consists of a series of components and
fittings to assemble a connecting flue on
gas, oil, wood and approved solid fuels.
www.docherty.co.uk

2. QSW316
Components
3
Straight
Lengths
Nominal Length 152mm 305mm 500mm 1000mm
Effective Length (L) 117mm 270mm 465mm 965mm
Ø127mm S5A1152 S5A1305 S5A1500 S5A1980
Ø152mm S6A1152 S6A1305 S6A1500 S6A1980
Ø177mm S7A1152 S7A1305 S7A1500 S7A1980
Ø203mm S8A1152 S8A1305 S8A1500 S8A1980
Ø228mm NA S9A1305 S9A1500 S9A1980
Ø254mm NA S10A1305 S10A1500 S10A1980
Straight
Lengths
with
Access Door
Nominal Length 305mm 500mm 1000mm
Effective Length (L) 270mm 465mm 965mm
Ø127mm S5A2305 S5A2500 S5A2100
Ø152mm S6A2305 S6A2500 S6A2100
Ø177mm S7A2305 S7A2500 NA
Ø203mm S8A2305 S8A2500 NA
Changeover
Length
Required prior to roof penetration to prevent water ingress into the flue
system. The component has a male crimp both ends.
L
Ø
Ø
Ø
L
Telescopic
Length
Two Piece
Nominal Length 305mm - 500mm 500mm - 900mm
Effective Length (L) 270mm - 465mm 465mm - 865mm
Ø127mm S5A1305T S5A1500T
Ø152mm S6A1305T S6A1500T
Ø177mm S7A1305T S7A1500T
Ø203mm S8A1305T S8A1500T
Ø228mm S9A1305T S9A1500T
Ø254mm S10A1305T S10A1500T
L
Ø
Nominal Length 1000mm 80mm
Effective Length (L) 925mm 10mm
Ø127mm S5A5305 S5A1980C
Ø152mm S6A5305 S6A1980C
Ø177mm S7A5305 S7A1980C
Ø203mm S8A5305 S8A1980C
Ø228mm S9A5305 S9A1980C
Ø254mm S10A5305 S10A1980C
L
For additional technical information contact sales@docherty.co.uk or call 01635 292400

3. 4
45° Elbow
30° Elbow
15° Elbow
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (A) 125mm 142mm 143mm 154mm 170mm 196mm
Offset (B) 64mm 70mm 73mm 78mm 84mm 85mm
Code S5A445 S6A445 S7A445 S8A445 S9A445 S10A445
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (A) 110mm 124mm 125mm 140mm 166mm 195mm
Offset (B) 25mm 27mm 28mm 31mm 30mm 33mm
Code S5A430 S6A430 S7A430 S8A430 S9A430 S10A430
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (A) 112mm 132mm 133mm 142mm 146mm 143mm
Offset (B) 19mm 24mm 24mm 28mm 19mm 26mm
Code S5A415 S6A415 S7A415 S8A415 S9A415 S10A415
90° Elbow Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (A) 171mm 248mm 235mm 242mm 260mm 305mm
Offset (B) 131mm 174mm 195mm 203mm 230mm 265mm
Code S5A490 S6A490 S7A490 S8A490 S9A490 S10A490
A
Ø
B
A
A
Ø
B
A
B
Ø
45° Elbow
with Door
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (A) 280mm 375mm 320mm 425mm TBA TBA
Offset (B) 65mm 80mm 100mm 105mm TBA TBA
Code S5A445D S6A445D S7A445D S8A445D S9A445D S10A445D
A
B
Ø
0-90°
Adjustable
Elbow
Diameter (Ø) 127mm (5”) 152mm (6”)
Height (A) 143mm 142mm
Offset (B) 180mm 184mm
Code ZS113005 ZS115017
Allows variable angles and offsets to be produced, but
must not be used to exceed 45° from the vertical
Ø
B
A
B
Ø
Ø
Visit www.planningportal.gov.uk
for current Building Regulations
Installation Instructions QSW 316 must only be installed by a competent
approved installer and in accordance with detailed installation instructions which are
available on request or can be downloaded from our website.
Components

4. 5
135° Tee
with Cap
90° Tee
with Cap
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (L) 450mm 450mm 450mm 450mm TBA TBA
Centre (A) 290mm 290mm 330mm 330mm TBA TBA
Offset (B) 127mm 140mm 162mm 175mm TBA TBA
Code S5A345 S6A345 S7A345 S8A345 S9A345 S10A345
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (L) 300mm 300mm 300mm 300mm TBA TBA
Centre (A) 150mm 150mm 150mm 150mm TBA TBA
Offset (B) 85mm 95mm 110mm 120mm TBA TBA
Code S5A390 S6A390 S7A390 S8A390 S9A390 S10A390
L
B
Ø
A
L
B
A
Ø
Standard
Cowl
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (L) 195mm 220mm 250mm 275mm 315mm 345mm
Code S5B5074 S6B5074 S7B5074 S8B5074 S9B5074 S10B5074
Ø
Wall
Bracket
50mm
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Code S5B5088 S6B5088 S7B5088 S8B5088 S9B5088 S10B5088
Provides lateral support to the flue system.
Ø
Joint
Clamp
Band
Increasers Diameter (Ø) 4” to 5” 5” to 6” 6” to 7” 7” to 8” 4” to 6” 5” to 7” 6” to 8” 7” to 9”
Height (L) 134mm 134mm 134mm 134mm 134mm 134mm 134mm 134mm
Code S4B8002 S5B8002 S6B8002 S7B8002 S4B46 S5B57 S6B68 S7B79
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Height (L) 44mm 44mm 44mm 44mm 44mm 44mm
Code S5B5086 S6B5086 S7B5086 S8B5086 S9B5086 S10B5086
Adjustable
Wall
Bracket
50mm - 235mm
Diameter (Ø) 127mm (5”) 152mm (6”) 177mm (7”) 203mm (8”) 228mm (9”) 254mm (10”)
Code S5B5089 S6B5089 S7B5089 S8B5089 S9B5089 S10B5089
Provides lateral support to the flue system.
For quick and easy clamping around joints between flue sections. Secured by toggle fastener.
L
Ø
L
Ø
L

5. 6
Warranty terms and conditions
Installation Guide
QSW 316 is manufactured to the highest quality standards.
Under normal operating conditions, QSW provides many years
of reliable service and carries a 2 year conditional warranty
depending on application, installation and maintenance.
The 2 year warranty covers any defect due to faulty manufacture;
this is provided the system has been installed in accordance with
the installation instructions and has been used for the purpose
it was designed for. Furthermore, the system must be regularly
cleaned, maintained and inspected (at least once per year, and
more regularly if the appliance is used continuously or frequently)
by a registered qualified sweep from either APICS, GMCS or
NACS or a HETAS approved engineer.
Written documentation to demonstrate the inspection and
cleaning of the chimney by an appropriately qualified person must
be kept to validate the two year warranty.
Use only quality fuels with QSW, such as seasoned logs, wood
pellets and chip to BS EN 14961. When solid mineral fuels such
as coal and smokeless fuel are burned, use only those approved
by HETAS or the Solid Fuel Association.
For guidance on fuel choices please visit www.hetas.co.uk.
Under no circumstances should an appliance be located where
there is the potential of chemical contamination of the
combustion air.
A chimney fire will invalidate the warranty. In the event of a
chimney fire it is always advisable to replace the connecting flue
pipe and any steel chimney system or liner.
QSW 316 must only be installed by a competent approved
installer and in accordance with the installation instructions
that are available on request.
Chimney and flue design
The chimney and flue design is the responsibility of the engineer
or installer and should conform to the requirements of these
instructions, the requirements of Approved Document J and,
where appropriate, BS EN 15287 part 1.
Any variation from these instructions and the standards will
require the designer to ensure the performance of the chimney
meets the requirements of the appliance by calculation using
the methods given in BS EN 13384 Part 1 or any proprietary
software program based on this standard.
Regulations and standards
The regulations and standards covering the design and
installation of a flue pipe in the UK are as follows:
Building Regulations
England and Wales - Approved Document J – Combustion
Appliances and Fuel Storage Systems
Scotland – Scottish Building Standards Technical Hand Book
Section 3
Northern Ireland – Building Regulations Part L – Combustion
Appliances and Fuel Storage Systems
Standards
BS EN 15287 Part 1 – Chimneys. Design, installation and
commissioning of chimneys Part 1: Chimneys for non-room
sealed heating appliances.
BS EN 13384 Part 1 – Chimneys. Thermal and fluid dynamic
calculation methods.
Flue sizing
The sizing of flues for appliances should be based on the type of
fuel and the appliance to be used.
• Gas Appliances
In the case of gas appliances the Building Regulations Approved
Document J table 5, the gas safety in use regulations and in all
cases as required by the manufacturer’s installation instructions.
• Oil Appliances
Flues for oil appliances should be sized in accordance with the
requirements of Approved Document J Paragraphs 4.4 and 4.5.
• Solid Fuel Appliances
The size of flues for solid fuel appliances should be in accordance
with the requirements of Approved Document J Paragraphs 2.4
to 2.7 and as given in table 2 of ADJ.
All combustion appliances require adequate ventilation to
operate correctly; ventilation should be provided in accordance
with Approved Document J or the appliance manufacturers
instructions, whichever is the greater.
The connecting flue pipe run should be studied and measured
accurately to reduce the need for cutting lengths and reduce
joints to a minimum.
All flues must have provision for cleaning and inspection both
internally and externally. Where the chimney is to be swept
through the connecting flue pipe then it is important to ensure a
suitably sized and stiffness of brush for the flue in the
chimney can pass through the pipe. If this is not the case, then
an additional cleaning access in the chimney will be required. If
the sweeping of the chimney through the flue pipe will put strain
on any of the joints, such as around bends and offsets, then
additional bracketing of the connecting flue pipe will be required
to avoid such damage.
QSW 316 can be installed as close as required to
non-combustible material, but should not be touching any wall or
surface it is not going to be sealed and connected to. For solid
fuel installations, QSW 316 has to be positioned a minimum of
three times its nominal diameter away from any combustible
material. Where a shield is provided as required in Approved
Document J, then this distance can be reduced to 1.5 times the
diameter. The shield must be of non-combustible material and
have a minimum 12mm air gap between it and the combustible
material it is shielding.
The best possible chimney system is straight and vertical at all
times, but in some cases it is necessary to have an offset in a
connecting flue pipe if the chimney and appliance outlet do not
line up. If this is the case then a maximum of two bends of up
to 45 degrees from the vertical are allowed in a connecting flue
pipe.
The weight of any chimney system or chimney liner must not
be borne by the flue pipe and it must be possible to remove the
connecting flue pipe without the need to remove any other part
of the flue or chimney.
The connecting flue pipe must be connected to the flue in the
chimney using an appropriate adaptor. This will vary depending
on the type of arrangement. The adaptor may be to a flexible
twin wall stainless steel flue lining, rigid clay or concrete lining,
factory made steel chimney system, or into an unlined chimney
via a register plate.
All these components are available within the Docherty range
of chimney systems and chimney liners.

6. QSW316Installation
QSW 316
can be painted
7
Minimum height of
600mm before an offset
Full Installation Instructions on Request
Adjustable
Wall Sleeve
Adaptor to
Twin Wall Chimney
45° QSW
Elbow with Door
QSW
Connecting Flue
Minimum height of
600mm before an offset
135° Tee
Wall Support
Bracket
Tee Cap
150mm maximum
Adaptor to Twin Wall Chimney available
from the chimney system manufacturer
QSW
Connecting Flue
90° QSW Tee
150mm minimum or more if required
by the chimney system manufacturer
Adjustable Wall
Support
Tee Cap
150mm maximum
Closure Plate
QSW
Connecting Flue
Top Hat Adaptor
Flexible Flue
Liner
90° QSW Tee
Closure Plate
Mounting Frame