It should work just fine. it will flow more air than the stock filter so you need to compensate either by controlling the fan speed or blocking a portion of it with a suitable material (heavy duty aluminum foil should work just fine for that).
The filter on the rear of the Hottop is the same as for a 120mm computer fan- 120mm x 120mm. it is not a matter of just mesh but of airflow. The computer fans are very free-flowing. Depending on the screen you get it might lose too much heat at a given fan speed compared to the stock filter. You need to compensate by either covering some of the screen's area or slowing the fan speed.
I make my own replacements. I have a bunch of leftover fiberglass batting from insulating my attic. I cut out an appropriately size square of it and peel off a decent thickness. I cut a piece of aluminum window screen to put on one side of the plastic case to prevent fiberglass from being blown out of the filter when the fan is on. Whenever the fiberglass gets gunked up enough I peel off a new bit of batting and replace what's in the case.
It seems to work fine. I haven't noticed my roasts taking longer so I presume it isn't flowing too much air.
If you examine the stock filter the plastic is two pieces. Snap it apart, remove the stock material, and put the screen in between and snap the plastic back together. it works with the computer filters if you flatten the countersink corners with a pair of pliers.
Use a cooker hood grease filter cut to size, the paper ones with the red striped. They have the same airflow as the Hottop one, with the added bonus of not being highly flammable. I have friends who have used them for years.
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