A stove jack allows you to safely extend a stovepipe through the roof or wall of your tent. Our stove jacks are constructed of fire proof 17-ounce [0.48 kg] silicone-coated glass material (18" x 18" [46 cm × 46 cm]) with a solid silicone ring. Stove jacks are temperature rated up to 700°F (400°C).
More photos here.
Question: Why are stove jacks NOT normally made of metal?
A. Metal would be difficult to transport.
B. Metal would conduct heat to the flammable tent fabric.
C. Something else.