The oven is not a general-purpose storage cabinet
Keeping baking sheets in an empty oven may seem harmless, especially when cabinet space is limited. But an oven is designed for controlled heating and airflow, not for storing household objects. The biggest risk is forgetting that something is inside when the oven is switched on.
The Whirlpool Built-In Electric Convection Oven Use & Care Guide gives a model-specific warning that flammable materials should not be stored in the oven. It also cautions against placing bakeware directly on the oven bottom or door and says the oven vent must remain unobstructed. Those instructions apply to the models covered by that guide; the manual for your own appliance takes priority.
Heat and airflow still matter
Whirlpool explains that hot air must circulate for even cooking and recommends leaving space around bakeware. A spare sheet pan on the oven floor or against a vent can change that airflow. In a convection oven, an obstruction may affect circulation; in any oven, extra metal can alter how heat reaches food.
This does not mean every stored metal pan will immediately damage every oven. It means the position, size, oven design, and manufacturer instructions matter. A pan that blocks a vent or sits where the manual prohibits bakeware can contribute to poor results or damage.
The forgotten-object problem is more serious
Towels, cutting boards, paper packaging, plastic containers, and cookware with rubber or plastic parts can melt, smoke, or ignite when the oven heats. Before preheating, open the oven and confirm that the cavity is clear. That is a universal household safety habit, independent of brand.
Do not line the oven floor without checking the manual
The Whirlpool manual specifically warns against lining the oven bottom with foil, liners, or cookware because permanent damage may occur. It also says not to cover the entire rack with foil because air must be able to move freely. This is manufacturer-specific guidance, not a universal claim about every oven.
Safer storage alternatives
Store sheet pans vertically in a cabinet divider, a narrow pullout, or a rack designed for bakeware. If the oven is used as temporary storage, remove everything before turning it on and keep flammable materials away from the appliance.
Bottom line
The safest default is an empty oven. Follow the manual for the appliance you actually own, keep vents clear, and check the cavity before every preheat.
