I have a DIY forge and venturi burner. Everything works really well and does what I need it do. However, If I ever turn the forge off and turn it back on before it cools down completely, it performs poorly. A flame comes out of the front of the opening about 6-8 inches, the overall sound has a higher whining sound and the burner pipe begin to heat up and glow red. If I allow the forge to cool down completely, this problem does not occur. From what I've read, this is a poor air intake issue. Also note, the forge is only open on one end. This is primarily due protecting a cinder block wall from the heat ( needs to be close due to space). So, is there a way to allow more air to be pulled in so the restart mixture of air:fuel is as clean as an cold start? Also, I don't mind opening the rear of the forge if this will help the air flow, but what is recommended to protect the wall from direct heat? Thanks!
