Wavebreakmedia Ltd/Wavebreak Media/Getty Images. Reps and sets are terms used in weight training exercises. They differentiate between the numbers of lifts that are done in quick succession and the number of times the series is repeated during an exercise session. A rep, or repetition, is the actual lifting and lowering of a a weight.
Standard door sizes start at 1 foot 6 inches and are offered at 2-inch increases to 3-feet wide. Fitting with standard door openings, stock door heights are 6 feet 8 inches; 7 feet; and 8 feet. If you live in an older house or have an unusual door opening, there are manufacturers who offer custom sizes. Doors are also available in a variety of colors.
The opening for the garage door is exactly 8 foot, and is marked as such on the plans from 1968. A bit of googling reveals this was a standard garage door size back then, and I'm not the first person to think of widening an old garage door opening.