I start out by gathering chakra into my stomach and converting it into katon chakra at the same time of doing so I preform 4 hand seals. When I feel like I finished with molding and gathering enough chakra I start channeling it forwards first in my lungs then in my mouth, in this period when I am channeling chakra into my lungs I finished with preforming hand seals. During period in which chakra is going trough my lungs I heat it up to make it as hot as possible. Now with chakra in my mouth I push it just a little bit forward towards the opening of my mouth.Just before releasing this chakra I use nature as well as shape manipulation to create ash. But this ash is diffrent from the normal ash because it is concentrated with katon chakra.As I exhale a huge amount of ash towards the dummy. As ash like cloud surrounds the dummy i click my teeths and by doing so the ash ignites and creates a huge explosion burning the dummy.
Advantages;
If ash covers my opponent complitly before he can use anything to defend himself it can make very severe burns and even finnish lethal depending on which part of body is covered.
You are deciding when is ash going to explode.
You can use it up to mid range.
Disadvantages;
One of problems with this technique is that ash can be easily blown away by using wind technique especialy if you are using this technique from mid range,giving your opponent oppurtunity.
Say is this the same tech Konuhamaru used in the OVA ? .-.