Cool video. I've actually used 4" Honeywell MERV 11 filters for my house. They work really well for getting rid of baby smells (milk, diapers, etc). Generally good for 6 months. I have two filters, the smaller one I can replace yearly. With really shitty allergies to mold, pollen, etc, they've definitely done the trick. That is, until fuckin filtersfast stopped selling them.
I've been using these lately. Most MERV 13 filters have raised my electric bill during the summer. Not these.
Amazon product ASIN B079G2PXX1