Technical data

26
Flues from Hamworthy
The Masterflue MF system from Hamworthy is a modular, twin wall,
insulated, fully welded flue solution, optimised for high efficiency
and condensing boiler applications.
Leak-Free
n Unique factory fitted tri-lip silicone gasket as standard ensuring a leak
proof, high temperature seal, impervious to water and vapour.
n All components fully welded and pressure tight, including traditionally
troublesome elbows.
Corrosion-Free
n Premium grade stainless steel construction for inner and outer walls.
n 87 degree elbows and tees to ensure condensate drains effectively.
Worry-Free
n Fast, push-fit assembly with no need for additional sealants.
n Precision finished, reliable components for high quality installation.
n Range of ‘Tru-Align’ adjustable wall brackets for simplifying alignment,
achieving a faster installation and neater finish.
n Continuous insulation from base to stub.
n Fire resistant - 4 hour fire rated.
n Stress-free thermal expansion.
n CE mark accredited to meet 2005 legislation.
Hamworthy also have the Masterflue ME flue component range which is a
single wall construction, fully welded flue system. The Masterflue ME range
is totally compatible and interchangeable with the Masterflue MF twin wall range.
Design & Install or Supply Only
Hamworthy’s extensive knowledge of combustion systems, and the flue
requirements for each boiler, makes a boiler and flue package the perfect
solution for every project.
Offering a comprehensive range of flue and chimney equipment for natural
draught, fan assisted and fan dilution applications, Hamworthy works in
partnership with Midtherm Engineering to provide a comprehensive flue
design and installation package.
Alternatively, Hamworthy can provide components on a supply only basis for
the contractor to install. Speak with Hamworthy Midtherm about your flue
requirements and get peace of mind on your next project - guaranteed.
Tel: [phone]
Email: [e-mail]
Purewell VariHeat boilers have a pressurised
flue outlet, enabling a flue installation to be
designed using smaller diameter components.
The following points should be noted:
n A suction condition within the flue is not
required, so it may be possible to achieve
a lower chimney terminal height, however
all installations must still comply with the
requirements of the Clean Air Act 1956
Memorandum.
n The flue system must be capable of
handling saturated flue gases in a positive
pressure system, particularly for the
condensing model, however, there will
also be condensate generated from the
non condensing models during certain
operating conditions.
n The boilers may be flued individually,
using Hamworthy fully welded Masterflue
components. Details of flue sizes and
length of flue runs are shown on page 27.
n Multiple boilers may be installed using a
common flue header. Please consult with
our flue technical team for further advice.
n The flue components should be fully
welded and CE marked for positive
pressure application.
n Draught conditions generated from vertical
risers should not exceed 10 Pa. Where
draught conditions are likely to exceed
10 Pa, it is recommended that a draught
stabiliser is fitted.
n Where multiple boilers are used, a draught
stabiliser located in the end of the header
is preferred to individual draught stabilisers
located on each boiler outlet.
Draught generated:
at 140°C, 4 Pa/m
at 80°C, 2 Pa/m
at 40°C, 0 Pa/m
n The flue system must be self supporting
and facilitate access for cleaning and
maintenance near the boiler connection.
n When designing the flue system, care must
be taken to ensure that any condensate
that may form within the system can be
drained safely to a suitable waste point,
and that the flue and drain materials
are resistant to the corrosive effect of
condensate.
n Purewell VariHeat boilers are suitable
for installation in a balanced compartment
in accordance with the requirements
of BS 6644.
Flue System
Purewell VariHeat Boilers