Apāna (Apana) was one of the gods who belonged to the Sādhya gaṇa (Sadhyagana; the genus called Sadhya) or Ajita gaṇa in Svāyambhuva (Swayambhuva) Manvantara.

Vāyupurāṇa(67.34)
Brahmāṇḍapurāṇa (Maharṣi)(2.3.16)