I used to order Merv 8 but decided to order 12 for extra filtering. After receiving it, I opened the box and proceeded to replace my old filter. However, I put both filters side by side and they are identical. There are no marks and the number of folds and everything else I could compare is the same. The box was incomplete so I'm not sure if anyone just put M8 filters in the M12 box. I tried to explain this to Vishlaj in the chat but they couldn't understand that I had ordered two boxes of filters, order numbers were given and I wanted to refund the price difference for each of the orders as the items received were around US$5-6 Dollars amounted each . box is smaller. I gave up. I would check your filters to make sure you got what you ordered.
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