Apparently they’re recommending we filter the air in our homes with a furnace filter strapped to the back of a 20" box fan due to the terrible air quality. As you might imagine, most are gone already. Or the ones of irregular size with a higher MERV rating are 40 bucks apiece.
I found these above that are still in stock with a MERV rating of 5 apiece. Can I... stack them to get closer to the recommended MERV rating of 11-14? Or is even that a waste of time/money? I have to believe that SOMETHING is better than nothing, right?