I just received some spare parts for the Vapir rise 2, and noticed that the new heating chambers are a different design.The bottom has less open area,and is solid metal, with 3 triangles, cut out.I estimate about 20 percent less air flow.I lined it up with an older v.2 chamber and it is a little bit more flared inwards.Definitely more robust than the old model, and much better suited to putting in a regular pipe screen if the stock screen fails..Haven't tried it out yet,but ,will report back, if the new design is any better functioning than the old one. [I wish it was easier to upload pictures on this site, or I would post them]