We are having our kitchen remodeled. We are reusing our microwave oven
(a Kenmore 665.6170911). The contractor says that there is supposed
to be a piece on top of it that lets air out the vent but closes to
keep anything from coming in. I looked in the manual and don't see
anything like that, even in the installation instructions. Is there
such a thing, and if so, how can I find out the part number for one
for this microwave oven?