received were genuine. The product itself is a legitimate MERV13 filter. I live on the top floor, about 1400 square meters. ft and it is humid and hot most days, with air conditioning running a good 16 hours a day in the summer, there is a noticeable delay on days over 90 degrees to bring the house up to the desired temperature in the low 70s by comparison To bring range lower rated filters MERVs generally recommended for a rating of Merv 8 with a difference of 7-8% which in my opinion is not a real disadvantage compared to the advantages of filtering out a large amount of unwanted molecules. I usually change about every two months so two packs of these baby things will last 4-5 months and for 100 a year I can't complain about clean air. Great job 3M
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