You are speaking of the holes at bottom that bring in the cool air? Wouldn’t it be the Kirksite alloy body?
Or am I misunderstanding you? Someone who has more knowledge with the mechanics should be able to help you more.
@OF you have any knowledge to drop on us?
Sorry, beats me, never seen it....... I'm not sure I follow the discussion, but think it's a concern about material safety (always a delicate topic)? What the cold part of the path is made from doesn't matter any more than what's in the room you're in. The key is what gets heated and how hot it gets? FWIW I think HR is on top of this 'issue' long before we got here?
One thing sure, material safety/health discussions tend to get really far afield quickly. Which is why such discussions are taboo on threads like this? They 'gum up the works' and almost never are resolved. Mystery vapor and all?
FWIW, I'm betting HR has another winner on tap. Not for everyone, of course, any more than the prior offering are, but sure to really suit some users?
OF