A quick question, sure, but it can't be answered quickly..
Size of the atomiser matters: reduced chamber means the vapour does not have that far to travel. This is generally why short profile attys deliver a warmer, and at most times, a more flavourful
vape. A bigger chamber allows more air to circulate inside the chamber, and so the
vape will be cooler.
Size of airflow: the bigger the airflow, the cooler the vape will be. This is generally why one can try more crazy builds because the airflow will be sufficient in keeping your crazy build from heating up too much. Smaller airflow is more ideal for restricitve lung or mtl hits. Generally big airflow is married with a big chamber, and small airflow with smaller chambers.
Bottom airflow: it is believed airflow feeding in from underneath your coil is best as it catches most of the vapour and directs it towards your mouth.
Side airflow: another effective method; however, it's best to place the coil either directly lined up with the airflow slots, or slight above so air can still get underneath the coil.
Top airflow: the trickiest to get right. Indirect airflow is not ideal; however, if the design still manages to direct the air to your coil, then all the better. In this case air is difficult to get underneath your coil, and so you run the risk of cooking the
juice, or even burning the cotton inside the coil at high temps.
That's my general knowledge thus far.
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