Chinese · Pronunciation Guide
fung, held high and flat. Ordinary f, a back unrounded vowel, and the nasal of "song".
fēng
Nothing shifts this pitch. The contrast worth holding onto is with 分 fēn, which shares the initial, the vowel quality and the tone and differs only in the nasal — front versus back. Since 分钟 and 风 both come up in everyday talk, the distinction is not academic.
Listen: 风
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今天风很大。
Jīntiān fēng hěn dà.
It's very windy today.
Listen: 今天风很大。
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今天风很大。 keeps hěn at a full dip before the falling dà — no conversion. Before that, jīn and tiān hold level and fēng holds level too, giving three consecutive plateau syllables at the top of the range. Then the sentence sinks to the floor and plunges from the ceiling on dà.
The vowel is routinely fronted to an English "eng" as in "length", when the tongue should be pulled back. And the nasal drifts forward to fēn, which is a real word. Feel where the tongue finishes: for -eng the tip should be resting behind the lower teeth. The three-syllable plateau in the example sentence is the other hazard.