When does passing wind become an annulment of Wudu' ?
All praise is due to Allah Alone, and peace and blessings be upon His Messenger, his family, and Companions.
What you have mentioned
nullifies Wudu’ if a person becomes sure that something has come out of them either by hearing a sound, detecting a smell, or other things ascertaining the passing out of (minor) ritual impurity (wind, urine or stool), because when the Prophet (peace be upon him) was asked about a man who gets the feeling of passing wind while in Salah (prayer), he said:
“He should not leave (prayer) until he hears a sound or detects a smell (of passing wind).”
(Agreed upon by Al-Bukhari and Muslim)
(Part No. 5; Page No. 256) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.