Lava-forge

Forge Body: 19 Gauge (1mm) Stainless Steel Sheet, No need oil painting,highly resistant to corrosion.
Dual gas burner( stainless steel made,see the photo for the dimension)
Forge external dimension: 6” (H) x 6” (W) x 16” (L) (16cm x 16cm x 40cm) .
Forge internal dimension: 4” (H) x 4” (W) x 16” (L) . Height with Brick : 3” (7cm)
30 PSI adjustable regulator, 5 ft (1.5 m) long gas hose.
Interior lined with 1 inch thick ceramic wool and refractory brick.
Weight: 16 LB (7.5 kg).
Instruction manual included.

Outer diameter ( O.D.) 2" air choke ( the 3 way tee with 2 mouth ) will attract maximum air flow into tube ,
it is self adjusting and drafts the proper amount of air based on gas pressure , with a proper gas tuned to produce higher BTU with less propane , this design is more efficient and saves propane cost .But if you want to adjust air flow or flame , it is easy to cut an aluminum cans by yourself to block part of mouth on the tee.
* The feed tube is 8" ( 20cm ) long ,3/4'' thread , outer diameter ( O.D.) is 1" . The flame cone on the bottom is 1-15/16"(48.5mm) O.D. wide. So you can open 1'' hole in your forge or furnace ( push in tube first, then screw the flame cone with tube inside forge), or open 2'' hole ( push the flame cone into forge)