If I look straight on I can see the white insulator, if I look on an angle it is open, Airflow is fairly decent on it, I have no problem with lung hits, a little restricted, but not bad at all.
I had originally ordered the more expensive version (and as I recall, the
only version available at the time I placed my order) from FT at $21.16, they have since
changed the pictures and clicking on the item number takes you to the $19.03 version by default, oh and my order ticket shows they lowered my original price to $20.10 from $21.16.... I am still not sure what the differences are, but mine had a air draw that was insanely tight... no way to lung hit. On the "B" version from FT ($20.10) which you have to select in the drop down menu, the inside insulator looks to be user removable, and what looks to show a wide open path from air inlet to under the coil. I could be wrong? but that is what it looks like to me from just the pics...
I managed to get the insulator out (of mine) using a blunt hex head driver and a pliers as a hammer to pound out thru the raised post. I then using a light rpm hobby dremmel type tool cut away some of the smaller insulator (which looks kind of like a wedding cake shaped, larger on the bottom smaller on the top), and I beveled the metal plate that holds the longer post (now its tapered in the center, think dog bone shaped). That helped a lot, I would compare it to a kayfun type draw
now... Not as open as my GT2. I may be being to over critical of it. Now with the modifications I made, its vape-able... before it was way too tight of a draw out of the box...There is no doubt, to me, mine had a QC issue and messed up somehow, but like I read somewhere, you cant expect perfection from a $20 clone of a $175 device...so a little tinkering comes with the territory. I wanted it solely for my wizard, which I rarely use... I couldn't justify spending the authentic price tag on it... Had I found an affordable bargain on an authentic I may have went that way, but now I am plenty satisfied.... and if/when I decide to take it apart again, I'll try to remember to snap a few pictures, which I completely forgot to do (DOH!).