General Electric WB02X10776 Charcoal Filter

IT IS ONLY ON ONE SIDE FOR A REASON (Two Independent Systems)
This filter fits perfectly in its intended position and there is only one filter for a specific reason. Explanation Below.

Actually the two fans are divided and control air that intakes from separate areas. If you do a little bit of inspecting the microwave, take a flashlight and shine it into the left fan and you'll see that the light doesn't shine through to the right which means they're independent of each other.

You'll also notice that the fan on the left is venting much more air(where this filter is to be placed). This is happening because it is the only fan that is recirculating the dirty air from the stovetop itself and that is why it needs a carbon filter.

The fan on the right (without a filter) actually intakes air from the top front right corner of the unit, which is clean air (place a piece of paper towel in front of it and turn it on and you'll see the suction). This air is then used to cool down the microwaves electronics and is vented out...

Badly designed microwave and filter.
I bought this filter for my GE JVM1540 microwave. ABT shipped it quickly.
My microwave didn't come with a filter when I bought it, so this is the first time I've used one. While installing it, I found a fatal flaw- the microwave blows air out of two ducts on the front of the microwave, but GE only provided the capability to install a filter over the left one. So you're only filtering half of the exhaust. Actually, I think you're probably filtering less than that- after I installed the filter in the left duct, even more air was exhausted from the right duct than before (I'm guessing the wind resistance of the filter causes air from the left duct to back up and flow out the right, bypassing the filter completely).

I don't see the point in buying a filter to filter only a portion of the air coming out of the microwave. And I can't believe that GE let that design flaw slip through.

How to install a perfect JVM1540 grease filter
The prefilter media sold for honeywell air filters can be used for microwave carbon grease filters, such as needed for GE JVM1540 DP1BB. Here are instructions.
The oem part is a charcoal filter in a metal casing. The size of the opening is 135x160mm, but the filter has to be smaller than this because of the thickness of the rigid metal casing and the plastic guides that hold the filter. Filters you buy online may fit somewhat correctly, but are not likely to fit precisely. However, if you buy carbon filter media, such as the Honeywell 38002 carbon pre-filter or equivalent, you can use scissors to cut a 135mmx160mm piece that will fit precisely in the filter slot.
To access the filter, depending on the exact model, you remove screws on top of the microwave, then open the microwave door, and remove the plastic vent cover that extends across the length of the microwave at the top. In my case, there are three screws, and once they are removed, the plastic piece needs to be slid...

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