Longest tunnel kiln

The Book of World Records officially recognizes that The longest tunnel kiln is 720 feet (219.45m) and was achieved by Carbonyx Inc (India), in Bharuch, India on 11 February 2012. Record attempt was organised by First Carbon Technologies (India) at their factory to demonstrate the longest tunnel kiln that converts coal coke substitute known as Cokonyx.The owner of the kiln is Carbonyx.Inc’s (USA)