I wish I had a way to test the true quality of filters, but this is my visual impression: - Filters seem lighter and thinner than filtrete filters and similar paper Framed Merv 13 filters I've used - fit pretty loosely compared to all the others I've used - question the Merv rating. Bought a Merv 13 filter. All the filters I have received have Merv 8 through 13 printed on the rim of the filter with a tick in box 13. Looking through the filters they look thinner and feel lighter than others Filters of well-known brands I have used. Maybe the person who tagged them got confused and accidentally tagged them as 13?
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