Usually, the inhale rate needs to be fairly slow, and the swirl only happens when drawing fast. If the material is swirling in the chamber, the draw rate is probably too fast for much vapor production. However, for an especially light and fluffy load and for an especially hot unit, you might get some vapor when a swirl pattern is showing. Vapor while swirling would not be common nor desired, however, as the vape would be especially hard to use -- the draw rate would have to be perfect every time. The other heating method the Box takes special advantage of is IR (infra red). The air in the chamber is not heated as much with this technique.