Number + 扇 + Noun (door/window)
扇 (shàn) is a measure word used to count flat objects that open and close, such as doors and windows. It is placed between a number and the noun it modifies. For example, 一扇大门 means "a large door."
他轻轻推开了那扇窗户,让风吹进来。
tā qīngqīng tuī kāi le nà shàn chuānghù, ràng fēng chuī jìnlái.
He gently pushed open the window to let the breeze in.
这扇门太旧了,关的时候总是发出响声。
zhè shàn mén tài jiù le, guān de shíhou zǒngshì fāchū xiǎngshēng.
This door is too old; it always makes a noise when closing.
走廊尽头有一扇红色的大门。
zǒuláng jìntóu yǒu yī shàn hóngsè de dàmén.
At the end of the corridor there is a large red door.