Should I remove the lower oven door before installing the combination oven?
Yes, it is recommended to remove the traditional (lower) oven door to help reduce the unit weight and provide easier access to handholds located inside the oven. However, do not remove the speed microwave or steam convection oven doors. Removing the lower door is cumbersome unless the detailed door removal instructions are followed carefully.
From the official Bosch HBL5751UC Oven manual, page 4
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