I think it is a well made video, good workmanship and he even mentions the dangers of using ceramic fibre but still uses the stuff!
I for one would not want that inside my home, every time you attend the fire you could be exposing yourself and family to toxic dust!
I did actually ask that question in the comments some time ago but never got a response.
The fastest and most reliable components of any system are those that are not there. Tiny ad:
Edible Landscaping With A Permaculture Twist/ Second Edition - Kickstarter