Product review (2 stars): There should be a blue layer and a better coverage of the black charcoal material
Not a "Genuine Replacement Part" or official Broan part.  This doesn't have the same level of filtering as the original, which is also referred to as the 41F filter.  There should be a blue layer and a better coverage of the black charcoal material.  This you can almost see through.  Will be returning this.