posted 1 week ago
The ceramic board is no doubt a very efficient material to use as a heat riser but it will become very frail and extremely dusty if disturbed in any way!
The glue with cure rock hard and quite likely give way over time, I would suggest adding some wire around the riser as you most certainly dont want to be handling the stuff once it has been super heated!
You could possibly drop a 8” (or whatever size required) tube over the riser and back fill the voids with loose vermiculite. That would make it more secure and avoid the outsides dusting the atmosphere.
The horizontal part of the chimney exit is not ideal but seems quite high up so should not be a big issue.
The dimensions look good, it should Roar……