From Safer nicotine wiki

Single vs dual coils

Single Vs Dual Coil Builds-Infographic You might have noticed that the decks of many atomizers are designed for two coils, i.e. they are made for dual-coil builds. Not all atomizers allow for both, and for those that do, you will usually get better performance with one of the two options. Check for the positive and negative posts of the atomizer, as each vape coil will have to go through both. Also, check the airflow of the atomizer. If the air is hitting the posts from both sides, chances are you are looking at a dual-coil atomizer.

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