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That's the only way I can buy my new house filters in the industrial 20 x 25 x 4" size they are. Currently run merv 12, in July I can install the 13, can custom make a 16 but it is only good for one month before it clogs. The twelve actually stops kitchen odors from spreading through the house and cleared the tahoe fire smoke. Wonder if there are differences in ratings?
N99 filters 99% of particles 1 micron or larger. Useless on smaller particles like covid.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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