Originally Posted by Ebberdene
The exterior dimensions are 22 3/4 inches wide, 28 3/4 inches tall with an approximate 4 inch tall ventilation "grate" on the bottom and 18 inches deep.
The size of the original refrigerator is not as important as the space that's available when you remove it. You might be able to use a replacement that's deeper or differently shaped. Refrigerator space is usually at a premium on a boat unless it's a very big boat.
I have a Nova Kool refrigerator on my boat and so far it's been trouble free.