UWELL Whirl 20 Manuel D'utilisateur page 54

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Notes & Precautions
Sub-Ohm Vaping (Direct Lung Inhalation)
While puffing, the vapor of an e-cigarette is directly inhaled into the lungs. This puf-
fing technique is referred to as sub-ohm vaping with direct lung inhalation. To achieve
this, there must be low puffing resistance and a strong air supply to the evaporator
head. Both have a positive effect on producing large quantities of vapor. Evaporator
heads that support this puffing technique in the sub-ohm range (resistance usually <
1 ohm) are often referred to as DL (direct lung) heads. (other abbreviations include
DTL and D2L)