I am not sure what my model number is but I have a Curtis microwave that is about 6 years old. My question is, the little like cardboard piece that you place on the inside of the microwave to cover the hole, I removed it like 5 years ago. It got something on it and it got messed up. Is it harmful to use the microwave? I know it is a little late 5 years later but someone said something to me that alarmed me about it. please let me know as soon as possible because it is really bothering me. Thank you! I have small children and I just want to know if it is safe to use without that piece. Thanks again for your time! I entered that model number but I do not know if it is the correct one, sorry