Yes, a 36 inch fridge can fit in a 36 inch opening if the refrigerator's cabinet width measures around thirty-five point six to thirty-five point nine inches. You must also plan for door swing and proper ventilation space. Using zero-clearance hinges and allowing one to two inches behind plus a quarter to half an inch on top for airflow ensures the fridge fits well without damage. Pulling the fridge slightly forward helps if walls or adjacent cabinets make clearance tight.