Got the filters first Bought from Walmart but then my heater started making weird noises. Strong sucking noise and when the heater stops, the heater duck metal makes noise as if it does not bend and pop. So I did a little research and read up on the Merv settings. The higher the settings the cleaner, but the downside is that the heater can be damaged causing it to work too hard. Then I check how much air is pulled out, almost none. The suction pressure bent the metal into shots. So I search the internet and everywhere for Merv's number but I got it and it annoyed me. Went to Revain and saw the Merv 8 filter at the lowest stage and when I put the new filter in my whole house got warmer and there was no sucking metal warp noise. I am very happy with this filter.
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