Twin Wall Flue - External - stainless steel-straight

Many wood-burning stoves come with the choice of attaching the flue pipe to either a top or rear flue exit. All things being equal, it’s best for a flue pipe to go up in a straight line in order to achieve the best draw and most efficient burn from your woodburner. 

For the adaptor you have the following options:

- Single to twin wall adapter (also increasing adapters)

To be pushed into the stove opening; sits inside the spigot of your stove and then connect to other twin wall flue pipe above. Or push into the stove pipe.

-

- Single to twin wall continental adapter

A continental twin wall adapter creates the easy connection of Twin walled flue pipe to any European model of stove.

The distance can be calculated as:  distance = G + E + D

G = distance heart of stove outlet - to- wall
E = thickness wall
D = distance outside wall - to - flue  (usually 50mm, but can go up to 350mm in case you want to go along a overhanging roof, without using elbows)

If the distance is fixed (you can not move the stove forward or backward) you will most likely need an adjustable T135 piece. When you have some flexibility in the distance between stove and wall; you can do with a - cheaper - simple T135 piece.

Together with the T135 piece, we will add:
- the 45 degree elbow
- the wall sleeve. The wall sleeve is meant to slide through the wall and to be cut to length as required. Add mortar around outside of it or fireproof insulation.
- 2 finishing plates, to cover the opening between the flue and the wall; both inside and outside.

You need a base support unit to that carries the weight of the outside flue. (A wall support only gives sidewards stability)

You can choose between:

- Base Support Bracket : Can carry the weight of maximum 5 m of flue

- Base Support: Can carry the weight of up to 12m of flue

Determine what the height (X) of the flue outside should be from the T upwards

Step 1:  Determine the required height on the roof (M)  
see " Complete information" below.

Step 2: Calculate the total height of the flue (stove to rain cap)

Total height of the flue (Z) = M + L - K
L = Height of the roof
K = Height of the stove

Step 3: Calculate how many meters (X) of straight pipes are needed outside (above the T)

X = Z - V 

Z = Total height of the flue (see step 2)
V = height coming from the stove till the T (it is written top right in question 3  " ...."mm upwards")

Check: The total height (Z) from stove to end cap should be at least 3.5 meter. 
You do not need to have the exact height, a bit higher higher is also okay.

Type of Wall support 

Normally the wall supports with a 50 - 70mm distance wall - flue are taken. To pass an overhanging roof, you can choose other distances.

Number of Wall supports

This depends on how many meters the flue goes along the wall. 
We recommend to use a wall support  every 3 meter along the wall.  So every 2 - 3 meter above the Base support; 1 wall support.

There are 2 types of cap to choose from:

Rain cap
Will keep vertical falling rain out of the flue. In case of side winds, rain will enter the flue. In case of a flue outside this is less of a problem, as it will not floote into the house. 

All weather Cowl
Keeps rain out of the flue. Also blocks downwinds from entering your flue. Downwinds come from higher objects in the vicinity (up to 10mtr), and without this Cowl they will blow the smoke back into your house.

You need to support the flue over the roof if the free end becomes too long and requires additional support. We recommend to use a telescopic support if the free end is between 1,5m and 3m.