As per your instructions, I donated these to Goodwill. I have already received your courtesy replacements with a grateful heart. Thanks for good products and superior service. You'll hear from me again. Wayland Jackson
The filter size was not true to industry norm. Consequently, the filter is loose and there is a gap on top of the filter, which the unfiltered air can pass through the duct.I had to throw away all the filters, go to nearest store and buy familiar 3M filters.