English to Portuguese Tech/Engineering Engineering: Industrial Smoking article

Fonte de calor combustível permeável? Me parece que o non-blind significa que é permeável ou perfurado.

As used herein with reference to the invention, the term “non-blind” is used to describe a combustible heat source including at least one airflow channel extending from the front end face to the rear end face of the combustible heat source. (...) The barrier between the non-blind combustible heat source and the one or more airflow channels may be adhered or otherwise affixed to the non-blind combustible heat source.