Huge enough for large cats
Make no mistake, this thing is enormous. It has to be big in order for my Maine Coon to fit in and move around comfortably, and in this aspect it is faultless. The entry flap is big enough for him but doesn't fit tightly enough to keep smells in. There were no instructions and I first fitted the door the wrong way around. The carbon filter is useless and does nothing to prevent smells, hence less than 5 stars. Other than that, Leevine is happy.