A flue works under negative pressure drawing the product of combustion from the appliance.
A successful “chimney draw” is dependent on the following principles:
The difference in air pressure between the appliance and the top of the chimney. (created by the height of the chimney)
The difference in temperature between the appliance’s exhaust gas and the outside temperature.
The quality of insulation along the length of the chimney.
It is essential to choose a flue diameter that matches the output from the appliance. An adequate air supply is also required for the appliance to operate safely and efficiently.
Always adhere to the right flue height and position even if it is a built cowl. Ensure the cowl is outside the reflux zone.
Adhere to the right flue diameter. The unit’s flue diameter is specifically sized to the kilowatt output of the fireplace.
Adhere to the right flue pipe material. Always place 1 meter of solid stainless steel pipe before converting to flex pipe. Flex pipe needs to be sleeved to the top of the chimney if possible. Switch to double skin after 4.5 meters.
Adhere to the specified safety distances and air gaps (around the unit) – As specified by the units manual.
Caulk and insulate the cavity to prevent heat loss.
Provide fresh air in the right position. Every unit must have a fresh air vent.
Install circulation vents and adhere to forced ventilation distances. Please ensure your outlet vents are outlets and your intake vents are intakes.
It is of crucial importance to have a proper hand over after a successful installation. The installation should be viewed as incomplete if this has not been done.
Stainless steel system chimneys consist of twoconcentric stainless steel metal walls with insulation filling the annular space between them. Some systems have a ceramic liner, which can offer a longer life. Factory made system chimneys are easy to handle and available with wide range of fittings such as elbows, terminals and tees, all of which simple lock or push together. They are easily assembled and supported with purpose designed support brackets.
These products, which can be used internally and externally, must be certified to BS EN 1856-1:2009. Stainless steel systems tend to be used in existing buildings that do not have a chimney and extensions, because they do not require a dedicated foundation and can be easily retrofitted.
AVAILABLE DIAMETERS: 80, 100, 130, 140, 150, 180, 200, 250
316 L Grade
stainless steel with BA finish.
MECHANICAL FIXING SYSTEM: Metal Bands
AVAILABLE DIAMETERS (Internal/External): 80/130, 100/150, 130/180, 150/200, 180/230, 200/250, 250/300
316 L Grade
MATERIAL (External): 304 Grade stainless steel.
INSULATION MATERIAL: Oriented fibre mineral wool. Density 100kg/m3. Thickness 25mm.
MECHANICAL FIXING SYSTEM: Pull ring supplied as standard.
Stainless steel flexible liners are certified to BS EN1856-2.
Flexible liners are used to reline an existing chimney. Care must be taken when selecting a flexible liner.
These liners should be used with wood and multi-fuel appliances. Single skin liners must never be used with wood or multi-fuel applications.
GUAGE: 0.1mm (Internal/External)
MATERIAL: 316 L Grade stainless steel
COUPLINGS: Metal screw type
Our Lead Flashing is designed to fit around the flue pipe onto the roof sheeting material. The Flashing consists out of 1000mm x 1000 mm lead plate with a 316 Stainless steel spigot welded to the centre of the plate. The spigot is either designed for a flat roof installation (0 to 5 degrees) or an inclined roof installation (5 to 35 degrees). Lead flashings are available for pipes ranging from 80mm to 300mm in outer diameter. The lead flashing is extremely durable and can be installed on and moulded to any roof material and profile. It is however compulsory to use a storm collar fitted on the flue pipe itself directly above the spigot of the lead flashing to complete the waterproofing installation. The storm collar prevent any water from entering via the spigot of the flashing. It is also compulsory to use a bituminous layer between the lead flashing and corrugated zinc roof sheeting, to prevent potential galvanic reaction.
One size caters for several diameter pipes. There are 2 overall size versions in the rubber boot flashing catering for all pipe diameters in our range, namely (80mm – 200mm) and (200mm – 300mm). The aluminium strip (corrugated roofs) or full aluminium sheet (tile roofs) is easily moulded to the profile of the roof. The rubber boot flashing is light weight, making it easy to take up roofs, handle and store. The rubber boot flashing seals tightly around the pipe, sealing it completely from any moisture ingress, while still allowing for expansion and contraction of the pipe itself. The EBDM rubber is specially formulated to be extremely durable in extreme climates and weather conditions with a life expectancy of 10 years. It can also be painted with acrylic paint to match roof colours.