1, the standard box-type: looks like a microwave. size 50CM x 40CM x 30CM. easily into home styles, 2, chassis: and often as you can see, is the mainstream programmes. Computer chassis Computer cases (10) 3,HTPC chassis: HTPC (Home Theater Personal Computer) or home theater PC chassis is mainly used in. There are both vertical and horizontal, mainly used to connect TV video and entertainment. 4, tower chassis: higher than normal chassis 1/2. internal space is very large, usually enthusiasts.