This is version 2 of my #DIY #CorsiRosenthalBox, this time built from a packing box for improved stability and longevity!
I only used 3 #MERV13 filters this time (because of placement constraints). This seems not to hinder #airflow & gives a hint, which side to place to the wall.
It has proven it's value. We are using it, when kids come over to play with our kids to support the #Masks they are using, when playing inside.
The #FilteredAir volume is a lot bigger than what #HEPA filters deliver!