National Emblem and National Flag of the Republic of China Act Article 7
When the national flag is hung near a door, it shall be hung on the upper left side of the door. The pole of the flag shall form a 30-degree angle with the door.If two flags are used, they may cross each other and be hung on top of the door or in parallel on both sides of the door.
中文原文 中華民國國徽國旗法第7條
門首懸國旗時，應懸掛於門楣之左上方。
旗桿與門楣，成三十度之角度。
如用兩面國旗時，可交叉懸掛於門楣之上，或並列於大門兩旁。
旗桿與門楣，成三十度之角度。
如用兩面國旗時，可交叉懸掛於門楣之上，或並列於大門兩旁。