New forge V-shape

[Okapi]

Hi rendoman,
A good idea illustrated for a very important adjustment with the gaz heating
For a portable metal foundry made with forced air combustion I've used drainage(not the right word possibly…)50mm. synthetic -possibly fiberglass but not heat formed - pierced tube as a base and an inner tube with a long slide and a exhaust pipe isolator between the heated part and the plastic one, it was the same principle as yours when it's not necessary to make a big and solid installation as for a forge.
Have a nice day.
Pierre