filters much smaller than stated size and comparable brands.
The website claims that their filters are1/8 to 1/4 inch smaller that the advertised outer dimension. Two of the sizes that I ordered were 1/2 to 5/8 inch shorter than the outer dimension. As a result, the filters do not cover the return opening. I have retrofitted them with cardboard shims so that I can use them. Their customer service seemed unfazed by my predicament.