Panasonic NE-1878 Operating Instructions Manual page 12

Care of Your Microwave Oven
CLEANING OF THE AIR FILTER
Clean the Air Filter regularly according to the following instructions.
If the Air Filter becomes clogged with debris, this will cause an
overheating problem with the oven.
1. Remove the Air Filter from the front bottom skirt by turning the right
screw to the left. Then slide the filter to the right and lift it off the
post at the left.
2. Wash this filter in warm soapy water and dry it completely.
3. Be sure to replace the Air Filter before using the oven.
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