vitreous stove pipe flashing

[Buritonian]

Hi

I have a 3kw wood burning stove in a wood summer house. As the stove is very small it would look better if we keep to 4" stove pipe all the way out... Is there a flashing kit available so we can do that or must we use a twin wall section where it passes through any kind of flashing? I've seen high and low temperature flashing available and wondered if that is what "high temp" flashing was for (unlined pipe).

 

[begreen]

Is this stove being placed in a fireplace with a liner or is it freestanding? If freestanding, the piping needs to change from stovepipe to high temp chimney when it leaves the room envelope.