qǐng dǎkāi chuānghu tōngfēng.

请 makes the sentence more polite. In commands or requests, it works a lot like please in English.

So:

• 请打开窗户通风。 = a polite request
• 打开窗户通风。 = more direct, like an instruction or command

In everyday Mandarin, 请 is very common when you want to sound courteous.

In modern Mandarin, 打开 is a very common verb meaning to open.

Even though the characters are:

• 打 = hit / do / make / many other uses
• 开 = open

together 打开 functions as a set verb meaning open.

Examples:

• 打开门 = open the door
• 打开电脑 = turn on / open the computer
• 打开书 = open the book

So in this sentence, it is best to learn 打开 as a single verb meaning open.

Yes. 通风 is a verb, and here the sentence uses a serial verb structure:

• 请
  • 打开窗户
    • 通风

Literally, it is something like:

• Please open the window, [in order] to ventilate / air out the room.

Chinese often places actions in sequence without needing extra words like to, so that, or in order to.

So the logic is:

1. open the window
2. let air circulate

That is why 通风 comes after 打开窗户.

It can cover all of those ideas depending on context.

Common senses of 通风 include:

• to ventilate
• to air out
• to let air circulate

In this sentence, it means something like:

• open the window to air out the room
• open the window for ventilation

So it is not just about the window itself; it is about improving airflow in the space.

窗户 is one very common word for window in Mandarin.

You may also see:

• 窗 — shorter, often used in compounds or more concise speech/writing
• 窗子 — also means window, colloquial
• 窗户 — very standard and common in everyday Mandarin

So 打开窗户 is a completely normal way to say open the window.

Mandarin does not have articles like a and the.

So 窗户 can mean:

• a window
• the window
• windows

The exact meaning depends on context.

In a sentence like this, listeners usually understand it as the window or a window that should be opened, because the situation makes it clear.

Yes. Chinese nouns usually do not change form for singular vs. plural.

So 窗户 can mean:

• the window
• a window
• the windows

Context tells you which one is intended.

If a speaker wants to be clearer, they can add a number or other word, for example:

• 一个窗户 = one window
• 那些窗户 = those windows

But in your sentence, plain 窗户 is perfectly natural.

Usually yes. It is commonly pronounced:

• chuānghu

The second syllable 户 is often in a neutral tone here in everyday speech, even though 户 by itself has its own full tone.

So learners often hear:

• chuānghu rather than a fully stressed chuānghù

This is very normal in common two-syllable words in Mandarin.

Good question. In isolation:

• 请 = third tone
• 打 = third tone

But in connected speech, third tones often change.

In 请打开:

• 请 stays third tone
• the 打 in 打开 is usually pronounced like a second tone because of third-tone sandhi before another third tone

So learners often hear something close to:

• qǐng dákāi

This is normal spoken pronunciation, even though the dictionary tone of 打 is third tone.

This sentence is natural and understandable.

A native speaker could definitely say:

• 请打开窗户通风。

Depending on context, they might also say things like:

• 请开窗通风。
• 请把窗户打开，通通风。
• 把窗户打开通风。

These are just variations in style.

Your sentence sounds like a polite instruction and is completely fine.

Yes, very often.

For windows and doors, 开 by itself often means open:

• 请开窗通风。
• 请开门。

Using 打开 can sound a bit more explicit or complete, but both are natural.

So:

• 打开窗户 = open the window
• 开窗户 / 开窗 = open the window

All of these are acceptable in normal Mandarin.

Not always rude, but definitely more direct.

Compare:

• 请打开窗户通风。 = polite request
• 打开窗户通风。 = direct instruction
• 把窗户打开通风。 = also direct, depending on tone

Whether it sounds rude depends a lot on:

• tone of voice
• relationship between speakers
• situation

Teachers, parents, coworkers, or signs may use direct forms without sounding rude. But if you want to be safely polite, keeping 请 is a good choice.