![A piece of cardboard from inside the Whirlpool microwave started going off, anyone know what this piece is? : r/whatisthisthing A piece of cardboard from inside the Whirlpool microwave started going off, anyone know what this piece is? : r/whatisthisthing](https://external-preview.redd.it/j5SiVTAcz8prAhOmXM7Cpvc07s3iUrJoTdTCPbHbxgU.jpg?auto=webp&s=84c09c2ecf4c575a5c1f2bf2c564f09dfa78eb33)
A piece of cardboard from inside the Whirlpool microwave started going off, anyone know what this piece is? : r/whatisthisthing
![Microwave Cardboard Shield, Universal Microwave Mica Sheet Wave Guide Cover Heat Insulation, 5 Pieces Microwave Sheet Protector Repairing Accessory for Home Kitchen Use 4.6 x 2.5 inch : Amazon.co.uk: Home & Kitchen Microwave Cardboard Shield, Universal Microwave Mica Sheet Wave Guide Cover Heat Insulation, 5 Pieces Microwave Sheet Protector Repairing Accessory for Home Kitchen Use 4.6 x 2.5 inch : Amazon.co.uk: Home & Kitchen](https://m.media-amazon.com/images/I/71plfxioaQL._AC_SL1500_.jpg)
Microwave Cardboard Shield, Universal Microwave Mica Sheet Wave Guide Cover Heat Insulation, 5 Pieces Microwave Sheet Protector Repairing Accessory for Home Kitchen Use 4.6 x 2.5 inch : Amazon.co.uk: Home & Kitchen
![It's a piece of thin cardboard, but I don't understand why it's inside this Kenmore 790.80333310 microwave oven. Any guesses what function it serves? : r/whatisthisthing It's a piece of thin cardboard, but I don't understand why it's inside this Kenmore 790.80333310 microwave oven. Any guesses what function it serves? : r/whatisthisthing](https://preview.redd.it/pygkzngisut01.jpg?width=640&crop=smart&auto=webp&s=fcfed746bfeddd7e7efa1105b02996bccb0797cb)