Most likely because metal is not known to be a very flammable material and can withstand the kind of heat that an oven is potentially able to produce.
oven mitts
heat makes metal expand.
Yes, if the trays are full.
Stainless steel and aluminum are commonly used to make oven trays because they are durable, heat-resistant, and conduct heat evenly for baking. They are also non-reactive with food, making them safe for cooking.
To clean the interior of an oven effectively, follow these best practices: Remove racks and trays before cleaning. Use a commercial oven cleaner or a mixture of baking soda and water. Apply the cleaner, let it sit, and then scrub with a sponge or brush. Wipe down the interior with a damp cloth to remove residue. Replace racks and trays once the oven is clean.
The advantage of oven drying method is that all the trays get equal heat and therefore the drying is uniform. The disadvantage is that the dehydrator has limited capacity.
Baking trays are typically made from aluminum due to its ability to conduct heat evenly and resist corrosion. Stainless steel and non-stick coated trays are also commonly used.
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cheese
Wood is porous and sucks in moisture. Also wood could catch on fire while in an oven.
No, just push one tray, pot or what ever you are cooking with to one side of the oven and the other to the opposite side so the bottom tray can "see" the top of the oven. if the trays are to big to do that half way through your cooking switch the trays so the bottom tray is on the top.
To move an oven safely and efficiently, follow these steps: Disconnect the oven from the power source. Remove any racks or trays inside the oven. Use a dolly or hand truck to lift and move the oven. Secure the oven on the dolly with straps or bungee cords. Use caution when navigating corners or stairs. Have someone assist you in lifting and moving the oven if needed. Place the oven in its new location and reconnect it to the power source.