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Title: Measure first!
Review: Who would have known that not all 20 x 25 x 5 air filters have the same dimensions? Not me! I bought this product and it wouldn't fit into my heating unit. The MERV 10 filter I had said 20 x25 x 5 on it in large numbers. Once I realized this MERV 8 didn't fit, I looked at my original filter more closely and realized that in fine print it said the actual dimensions are smaller. I guess it is my fault for not checking, but when a company puts its size in its product's name, you would expect them to be uniform. Very frustrating! Now I have to ship this one back.
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