Flues and Cowls
Stainless steel flexible liner is used to re-line existing chimneys where they are currently unlined or where the existing liner has broken down. It should not be used as a primary liner in a chimney built since 1965.
The liner for solid fuel comes in two grades. 316 grade liner can have a useful life of about 10 - 15 years if wood is used but will be considerably shorter if smokeless coal is used. The higher grade 904 liner can last up to about 20 - 25 years.
Although stoves can be installed in a chimney without a cowl they do perform several important functions.
Cowls come in many, many different types, shapes and sizes. They help to deflect rain from coming down the chimney and inside the liner which can be damaging. Some are used to support the flexible liner and sit on top of the chimney pot.
Some have bird guard mesh to stop birds from nesting inside the chimney when the stove is not being used. Some are designed to help with poor draught.
Twin Wall Chimney System
Twin wall chimney system are used to install a stove where there is no existing fireplace or chimney. There are a large number of manufacturers and all the systems are slightly different.
You cannot intermix the key components of different systems. We can supply Midtherm HT-S, SFL Nova, Selkirk, Rite-Vent ICID and Stovax XQ systems.
We supply black vitreous enamel flue pipe in sizes from 100mm to 200mm and in standard 150mm, 300mm, 500mm, 600mm, 900mm, 1000mm and 1200mm lengths. The bends are angled at either 15, 30 or 45 degrees.
We can also supply 1mm 316 grade stainless steel pipe and bends in similar lengths and sizes.
The type of roof flashings generally used are either the rubberised Masterflash which are predominantly used for sealing twin wall chimney systems to smooth or corrugated roofs whilst the angled lead flashing is used where the chimney system penetrated a normal pitched slate or tile roof. There are numerous sizes available.