This 30 IN Black Heat Deflector must be used if your warming drawer is installed directly beneath a wall oven or for a flush installation. This Deflector protects the items inside the warming drawer from becoming overheated or damaged by the oven. This Deflector protects the items inside the warming drawer from becoming overheated or damaged by the oven. Installing this accessory will require basic hand tools, some disassembly of the appliance and novice repair experience. You must unplug the appliance or shut off the house circuit breaker before installing this accessory. Installing this accessory will require basic hand tools, some disassembly of the appliance and novice repair experience. You must unplug the appliance or shut off the house circuit breaker before installing this accessory.