GE JNM1851DMBB Owner's Manual page 37

About the exhaust feature.
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The Vent Fan
The vent fan has a metal reusable grease filter.
Models that recirculate air back into the room also
use a charcoal filter.
Reusable Grease Filter
The reusable grease filter traps grease released by
foods on the cooktop. It also prevents flames from
foods on the cooktop from damaging the inside of
the microwave.
For this reason, the filter must ALWAYS be in place
when the hood is used. The grease filter should be
cleaned once a month, or as needed.
Removing and Cleaning the Filter
To remove, slide it to the side using the tab.
Pull it down and out.
To clean the grease filter, soak it and then swish it
around in hot water and detergent. Don't use
ammonia or ammonia products because it will
darken the metal. Light brushing can be used to
remove embedded dirt.
Rinse, shake and let it dry before replacing.
To replace, slide the filter in the frame slot at the
side of the opening. Pull up and in to lock
into place.
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