Wall ovens live or die by the cabinet cutout. Tell me what cabinet you have (or plan), and I'll tell you what fits: single, double, or a combination with a microwave or speed oven above.
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How this works: Wall ovens are sold by nominal width (24/27/30, with 30 the most common) but installed by cutout: the opening is a couple of inches smaller than the cabinet face, and every model publishes its own cutout spec. Singles need roughly 27-29 inches of cutout height, oven-plus-microwave or speed-oven combos about 42-45, and doubles 50-53. Around 90% of wall ovens are electric, but gas models exist. Always confirm final numbers against the manufacturer's installation guide before you order.