We need to calculate how many straight elements we need going upwards; knowing that we already added some length to the flue through the adapter and the offset.

Step 1 : calculate how high the flue should be on the roof
To determine the required height on the roof (G) see " Complete information" below.
Step 2: Calculate the total height of the flue (stove to cowl)
Total height of the flue = B+C+D+E+F+G. (In case of a 1 storey house; D, E and/or F can be 0)
Check: The total height from stove to end cap should be at least 3.5 meter (building regulation recommends 4.5 meter).
You do not need to have the exact height, somewhat higher is also okay.
Step 3: Determine how much length is in your shopping cart already
In your cart is already:
- length from a starter length or adjustable connector (if you did chose one) - Question 2
- length from the offset - Question 4
Step 4: Calculate the length that has to come from the straight pipes
Total height of the flue - what is in your cart allready.
Note: a bit higher is okay, but do not take a lower height.