5
Mi-Flues System 1 should be fitted at least three times
the diameter of the connecting flue pipe away from any
combustible materials.
Excessive runs of single wall connecting flue pipe
should be avoided and limited to no more than a
maximum of 1.8 metres.
Connection to the appliance
Height of Connecting flue pipe
Bends in Connecting Flue pipes
Top Outlet Appliance—The connecting flue pipe
should have no more than two bends in its length
with an angle no greater than 45° when measured
from the vertical.
Where possible the connecting flue pipe should rise
vertically straight.
Rear Outlet Appliance—Connection to a rear
outlet appliance may be made using the 90° Tee
where the removable tee cap will be accessible.
The maximum horizontal distance from the outlet of
the spigot should be no more than 150mm on solid
fuel appliances, subject to the appliance
manufacturers installation
Distance to Combustible Materials
Connection to System 2 twin wall chimney
Connection to Flexible liner within a brick
chimney
Connection to Mi-Flues System 35 flexible flue liner
can be made either from directly under the chimney
where the appliance is positioned within a fireplace
or through the side of the chimney using a System
35 adaptor (see illustration on front cover).
Mi-Flues System 1 Single Wall Connecting Flue Pipe and Rigid Flue Liner
System 1 is designed to fit straight into the
appliance outlet spigot without the need for an
adaptor.
System 1 should only be used to make the
connection between the appliance outlet spigot and
the chimney. It should not pass through any roof
space, partition wall or floor, except to pass directly
into a chimney through a wall of the chimney (see
installation illustration on page 6).
All System 1 joints should be sealed with Mi-Flues
high temperature sealant (rated to 1000°C) or fire
cement should be applied.
Safety / Installation / Regulations
Chimney Plate
On completion of installation a chimney plate should be
completed. The chimney plate provides information
regarding the Manufacturer, designation, nominal size,
distance to combustibles, Installer name, installation
date, chimney location and thermal distance.
It is to be completed by the Installer and securely fixed
in an unobtrusive but obvious position within the
building such as next to the electricity or gas consumer
unit, next to the chimney or hearth or next to the water
supply stop cock.
Cleaning / Maintenance
Adequate provision should be made for inspecting and
cleaning the chimney system. Access components are
available in the product range (bends with doors and
tees) and should be installed to suit the installation,
unless sweeping can be undertaken through the
appliance.
The chimney should be inspected regularly and
cleaned at least twice a year, depending on usage and
type of fuel used. This should be carried out with the
use of a brush which should not be made from black
steel.
The chimney should be maintained to ensure that the
construction remains in good condition.
Any components showing signs of deterioration which
may affect performance should be replaced under
professional advice, any evidence of leakage identified
by smoke staining should be rectified immediately.
Handling and Storage
All System 1 components are labelled. Fitting
instructions appear on the label where applicable.
These labels should be removed from the product prior
to installation and relevant information transferred to
chimney plate. Products should be stored in a dry
suitable storage location.
The product is easy to handle, but care should be
taken when holding, fitting or assembling any part of
the system.
Users are advised to use suitable precautions such as
gloves, eye/face protection, protective clothing etc to
avoid injury.
Installers should be aware of the possibility of
disturbing asbestos when working in older properties.
This should be dealt with in accordance with the strict
guidance documents. Particular attention should be
taken to ensure suitable PPE is used when applying
certain fireclays which can be of a caustic nature, as
well as when using any other substances which may
be harmful.
Life Expectancy
Under normal operating conditions, and providing the
system is installed and maintained correctly,
Mi-Flues System 1 should provide many years
service and is provided with a 10 year life
expectancy.
Structural Considerations
As System 1 does not rely on Locking Bands to
secure the joint, it is critical that the system is
installed between two fixed and secured points
(appliance outlet and chimney inlet).
Where an offset is installed, each bend must be
adequately braced using suitable support
components to restrict any movement of the joint.
Safety / Installation / Regulations
When a System 1 flue pipe is joined to our System 2
twin wall insulated chimney which penetrates a
ceiling, the System 2 chimney should protrude
425mm below the ceiling on a 125mm diameter
chimney and three times the diameter for 150mm,
180mm and 200mm .
Connecting flue pipe components should extend a
distance of 600mm off a solid fuel appliance.
This connection can be sealed using Mi-Flues high
temperature sealant (rated to 1000°C) or a fire
cement and the connection must be made in the
same room as the appliance itself.
