German · Pronunciation Guide
dass FEN-stuh. The st in the middle is a plain st, not 'sht', and the -er ending softens to 'uh'.
FEN- takes the volume and -ster trails away. The plural Fenster is identical to the singular, so nothing at all changes rhythmically between one window and several — the article does the whole job of marking number, which is worth knowing because the ear gets no help.
Listen: das Fenster
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Das Fenster ist offen.
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Listen: Das Fenster ist offen.
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Das Fenster ist offen puts a vowel-initial word after a consonant-final one, and German inserts a small glottal catch between ist and offen rather than gliding across. Offen itself collapses its ending onto a syllabic n, so the sentence ends on a hum.
Learners who have absorbed the sht rule over-apply it and say 'FEN-shter'. The rule works only at the start of a word or stem, and here the s closes one syllable while the t opens the next. The ending is the second habit, where an American r replaces what should be a plain dark vowel.