Correct
开间
/ kāijiān /
Strokes
Definition
alcove/bay in a room/unit of length used for rooms, approx. 3.3 meters
Example
As a Noun
standard width of a room in an old-style house ［about 10 chi （尺）, the length of a purlin］
1
Shuāng
双
kāijiān
开间
one-room house about 20 chi wide
2
Shàn
单
kāijiān
开间
one-room house about 10 chi wide
As a Noun
width of a room
3
Zhè
这
fángzi
房子
kāijiān
开间
hěn
很
dà
大
。
The room is very wide.
As a Noun
bay