Quote Originally Posted by t00fatt
Do the bowls have a screen on the top and bottom or is it open? In the picutres I saw it looked like the bowl was just a empty tube with no screens.
I don't have that model but my whip vaporizer has a screen to hold the herb in the right place. My old school conduction vape on the other hand does not have one because there is very little air run over the herb.

But considering that conduction vaporization is the least efficient (about as efficient as a regular bowl of the same size in a bong) you'll probably be running convection vape (as most modern design are) and that works by rushing air over the herb. My guess is the screens are in the device rather than in the tube.