ˈoʊnli bˈaɪpæs ˈɛɹ ɪz ɐlˈaʊd tə pˈæs θɹuː ðə fˈæn, ðɪ ˌɛlpˈiː kəmpɹˈɛsɚɹ ˈɛɡzɪt flˈoʊ pˈæsɪŋ θɹuː spˈɛʃəl pˈæsɪdʒᵻz wɪðˌɪn ðə fˈæn dˈɪsk, dᵻɹˈɛktli ˌʌndɚnˈiːθ ðə fˈæn ɹˈoʊɾɚ blˈeɪdz.
Only bypass air is allowed to pass through the fan, the LP compressor exit flow passing through special passages within the fan disc, directly underneath the fan rotor blades.