I am looking for a parallel of this kiln construction, excavated in the territory of Bulgaria. The structure was discovered in a Roman villa rustica, dated to the second half of the 2nd – third quarter of the 4th c. AD (Aleksandrov 1983, 72-75). The site was situated near the the modern day (and also the Roman) town of Montana (in the Roman provinces of Moesia Inferior/Dacia Mediterrranea).
The construction comprised four two-chambered structures (two with perforated and two with solid intermediate floors) connected by a long praefurnium (image – Aleksandrov 1983, p. 60). The fire was ignited into the lower chamber of the largest structure from where the hot air was transfered to the other three parts of this facility (Aleksandrov 1983, 60-61).