The 1600 series is available with various types of springs.
A 1602, for example, uses a size 2 spring which is for smaller doors.
You can also order a 1602, 1603, 1604 and 1605 model, each with increasingly larger springs for larger doors.
Most people don't want to have to worry about getting exactly the right spring size.
The order an adjustable spring closer, the 1601. This covers spring sizes 3 - 6 and works on the most common door sizes.
A standard door uses a size 3 or size 4 door. Size 3 would be for a standard interior door while size 4 for exterior.
When trying to meet ADA standards (Americans with Disabilities Act) certain rules apply.
Norton came out with a version of the 1601 called 1601BF (Barrier Free). This has an adjustable spring as well,
and the sizes are 1 - 4. Just be careful about using this on an exterior door.
If the door opens easily and no wind conditions are a problem it will work fine.
If your situation is like most and the weather changes, the 1601BF may not be strong enough to close the door.
The best choices then are 1601BF for interior doors and model 1601 for exterior doors.