We bought this product long time ago and used it for our lovely cats. I think the ventilation problem is the reason caused the strong litter smell built inside the bench, so all my cats did not want to get inside to use their litter box. Instead, they started urine around and caused lots of troubles and these cats never did such thing before! So, now we put it away in the garage, to put something in there as a storage box. We will not buy this again for sure.