Called the "Air-A-Lator" by Bernard Dalsin mfg. It carries a UL listing mark, though I don't see what std it is listed to in the catalogue.

There are variations on the Air-A lator such as sizes and one unit that is a box which sits over the ash dump yet places the air at the front of the fire. A separate screened intake is cut into the ash pit or the clean out door is replaced with an 8x8 screen made for that purpose.

HTH

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