Look for an aluminum tag--or a silver or white adhesive label. The model number may be printed or stamped onto the tag and it may be written in two different type sizes or styles.
Built In
With door open, mounted to left, right or top cabinet door frame.
With door open, mounted to left, right or top of door.
Portable
On the back at the top or side of the hose storage cover.
Inside the door jamb, to the left, right, or top.
On the door, to the left, right or top.
On the back of the unit.