In the name of Allah, the most Beneficent, the most Merciful.

Answer

If no noise is made when blowing then this is the same as breathing and the salah does not break but to do this on purpose is Makruh.  If by blowing two words are said that a third person can recognise such as ‘ooh’, then the salah will break.   (Guniyatul Mustamli)

Only Allah Knows Best

Mohammed Tosir Miah

Darul Ifta Birmingham.