This is the "Hydrophilic Coating Filter (Black)" purchased from Tsuhan Seikatsu (Mail Order Life). It's made by coating a hydrophilic paint (ceramic-based) on a filter fabric (aluminum). This gives it a property that easily mixes with hot water, allowing oil stains to be removed with water or hot water washing. When soaked in water or lukewarm water, water penetrates between the hydrophilic coating on the filter surface and the oil stains. Washing with a sponge makes it easy to remove the dirt. I no longer need it as I replaced my range hood, but it was a "good product," so I'm offering it for reuse. I believe Tsuhan Seikatsu no longer carries it, so I hope those interested will consider it. It has been cleaned, so it can be installed directly (approximate outer dimensions: 297 x 342). Simply remove your current slot filter and replace it. If you swap it out during your big cleaning, you'll be free from replacing those sticky non-woven fabric filters! #BigCleaning #NonWovenFabricFilter #Velas #Coating #Hydrophilic