From Wiktionary, the free dictionary
ду́хам (dúham, “to blow”) + -ало (-alo) (instrumental suffix)
духа́ло • (duhálo) n
- blower, bellow
- mouthpiece of a wind instrument
- духа́ч (duháč, “blower”) (agent noun)
- “духало”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Sofia: Bulgarian Academy of Sciences, 2014
- “духало”, in Речник на българския език [Dictionary of the Bulgarian Language] (in Bulgarian), Chitanka, 2010