После продувки шум исчез.

Because после requires the genitive case in Russian.

• Dictionary form: продувка
• After после: продувки

So the pattern is:

• после ремонта = after the repair
• после урока = after the lesson
• после продувки = after the blowing/purging

This is one of the most important things to remember in the sentence: после + genitive.

This is a spelling rule.

The noun продувка ends in -ка. In the genitive singular, many feminine nouns in -а change to -ы or -и. After certain consonants, including к, Russian uses -и, not -ы.

So:

• продувка → продувки
• книга → книги
• ручка → ручки

This is due to the Russian spelling rule often summarized as: after г, к, х, ж, ч, ш, щ, write и instead of ы.

Продувка is a noun meaning something like blowing out, blowing through, or purging with air/gas. The exact English translation depends on context.

It is often used in technical or mechanical contexts, for example when air is blown through a part, pipe, or system to clear it.

It comes from the verb family:

• продувать / продуть = to blow through, blow out, purge

So после продувки is literally after the blowing-out / after the purge / after blowing it through.

Шум is in the nominative case because it is the subject of the sentence.

The basic structure is:

• После продувки = adverbial time expression, after the purging
• шум = subject, the noise
• исчез = verb, disappeared

So the sentence is built like:

After the purging, the noise disappeared.

Исчез is the past tense masculine singular form of исчезнуть = to disappear.

In the Russian past tense, the verb agrees with the subject in gender and number.

Since шум is:

• singular
• masculine

the verb is:

• исчез

Compare:

• шум исчез = the noise disappeared
• проблема исчезла = the problem disappeared
• явление исчезло = the phenomenon disappeared
• звуки исчезли = the sounds disappeared

So исчез is chosen because шум is masculine singular.

The standard literary form is исчез.

The infinitive is исчезнуть, but the normal past masculine form is usually:

• исчез

You may sometimes hear or see исчезнул, but исчез is the standard form learners should use.

So in a neutral sentence like this, шум исчез is exactly what you want.

Yes. Russian word order is flexible, though the emphasis changes.

The sentence given:

• После продувки шум исчез.

This sounds natural and neutral, with the time setting first: After the purging, the noise disappeared.

You could also say:

• Шум исчез после продувки.

This puts the main statement first and the time phrase after it. The meaning stays basically the same.

Russian often moves words around for focus, theme-rheme structure, or style, not because the grammar changes.

Yes, normally it does.

A phrase with после + noun usually means after that event/process as a completed point or stage.

So после продувки suggests:

• the blowing/purging happened
• then, after that, the noise disappeared

If you wanted a fuller clause, Russian could also say something like:

• После того как продули, шум исчез.

That makes the sequence even more explicit: After they blew it through, the noise disappeared.

It sounds somewhat technical because of the noun продувка.

A native speaker would expect this in contexts like:

• mechanics
• engineering
• maintenance
• equipment troubleshooting

The rest of the sentence is completely ordinary Russian, but продувка gives it a more specialized feel.

A useful pronunciation guide is:

• по́сле проду́вки шум исче́з

A few notes:

• после = stress on the first syllable
• продувки = stress on -ду́в-
• исчез = stress on the last syllable

The final consonants are pronounced clearly, and Russian unstressed vowels are reduced, so the written vowels may sound weaker than an English speaker expects.

Yes. Russian often uses either a noun phrase or a clause.

This sentence uses a compact noun phrase:

• После продувки шум исчез.

A more verbal version could be:

• После того как систему продули, шум исчез.
• Когда всё продули, шум исчез.

These mean roughly the same thing, but they are less compact and more explicit.

The noun version is common when the context is already clear and especially in technical language.