Why do we sit while performing havan?

This is my own thinking . I observed that whenever we are performing havan or homa  , we sit in front of fire . I observed that when the fire is lit , the people who are standing begin to feel hot and sometimes cough too . But not the people who sit near the fire . Why it is so?



According to Hindu tradition , we always perform havan , sitting on ground near the fire . But there is a scientific explanation for this .


We know when we lit a fire  , we get smoke . Now this smoke is hot and lighter than oxygen filled surrounding air . So , obviously the smoke rises upward towards the ceiling .



That means , the air at the ground level is still cool . Cool air is always heavy and settles down at the ground level . So people who are performing the havan are in a cool and oxygen filled air level .


When we performed house warming ceremony of our new house  , I observed that the ventilators of house are blackened . But not the walls .


This clarifies my argument on smoke as it is lighter than normal air . It tried to escape through the ventilators  as it has gone upward .


Based on same logic  , our ancestors made it a custom to sit when performing havan .