Furnace Filter

I've changed a lot of furnace filters over the years, but haven't seen one of these before. Does anyone recognize it? It has a poly foam element sewn over a wire frame. Is this supposed to be washable? Can it just be replaced by a generally available 1" filter?

Thanks,
-Steve

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source https://hvac-talk.com/vbb/threads/2242630-Furnace-Filter?goto=newpost