Flue Lining Rules
There are eight rules you should follow before installing any flue lining.
• Always make sure that you are using the correct diameter lining for the appliance. If you have any doubts, check with the manufacturers.
• Sweep the chimney thoroughly before installing the lining.
• Use a tapered nose plug to protect the lining during installation.
• Seal the top and bottom connections and other inlets to the space between lining and chimney.
• Insulate clearance between lining and chimney where this exceeds 25mm all round.
• Always fit a flue terminal.
• Never use a flexible flue lining as an exposed flue pipe.
• Never use a flexible flue lining with solid-fuel appliances.
Lining existing chimneys
Although it is possible to line an existing chimney with pipes or tiles, in some cases this would entail a considerable amount of alteration-possibly rebuilding the entire chimney. In most cases a flexible steel liner can be used, other than with solid-fuel appliances.
Ideal flue conditions can easily be created by connecting the boiler to a flexible metal liner installed in the chimney space. This has two advantages: the flue can be matched exactly to the boiler’s requirements; and it protects the chimney itself from the harmful products of condensation.
Stainless-steel linings are also light-weight and flexible. These are produced in a wide variety of diameters and the one grade is suitable for many types ofor oil appliance. These tubes consist of laminated metal strips, spirally wound to form a tube of great flexibility.
They must not, under any circumstance, be used in conjunction with fires burning solid fuel. This is because some solid fuels produce hydrochloric or sulphuric acids which attack the liner.
Installation of a flexible flue is quick and simple. The following materials are all that are required:
• A clamp seal matched to the size of the lining and the flue to be lined. This item locates the lining firmly at the top of the chimney.
• A tapered plug-or nose cone-to suit the diameter of the lining. This protects the lining and guides it round bends.
• A length of rope about 9m longer than the flue to be lined.
• Condensate drain (if required) for connection at the bottom of the lining.
• Thermal insulation is needed if the clearance between the lining and the chimney exceeds 25mm all round. This gap between the brickwork and the lining should be insulated with a loose infill, such as vermiculite or mineral wool.
• Flue terminal or cowling, for connection to the top of the lining.
10. November 2011 by admin
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