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Looks like a newly installed portion of a regular furnace filter, it will keep a lot of "stuff" from migrating into the basement area. I have a dog and have had those grates off the steps several times and have found no dog hair beyond the grates but I am not living in my unit even close to full time.
Personally I don't find the whole filtration thing a real big deal, having said that my opinion might change if I were full timing. I vacumn out the vent area's at least once a year and find most of what is there comes from dropping down the register not pushed there by the fan. We visit the Yuma area each year and there is a lot of airborne particularly on windy days, this finds it's way into the unit and the majority of the time we are not running the furnace to spread it around. It just gets in and settles everywhere.
Ya just gotta do what ya gotta do, that's all.
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