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Review title: Beware of Sizing!
Product review: The overall quality of the filter is average to maybe a little above for a MERV 8. The real issue is the actual size of each filter. As stated by the manufacturer's specs, these filters are made or cut smaller than the normal size for each category. This is a real problem for many furnaces that take fitted filters in a bracket or tray. Without shimming around the sides of the filter, the air flows around - not through the filter. Air is like water and will take the path of least resistance. Unless you are sure an undersize filter will work in your furnace, do not buy this brand. It's kind of like orange juice and ice cream, maybe no one will notice if we reduce the size and charge the same price. I made the wood shim to seal the sides until I use up my supply but will go back to paying the higher price of the 3M next time.
