The class of MOT lift (Bay) is dependent on what type of vehicles you wish to test.
For example, if your garage or workshop work on cars, you will be a class 4 MOT station.
If you work on cars and light commercials, then you would require class 7.
Installing any class MOT lift is dependent on the space available. You need to have the correct height, width, and length to determine which lift is the correct fit for your business.