On Thursday, August 8, 2019 at 3:04:36 PM UTC-5, DerbyDad03 wrote:
My son grabbed some lumber off of Free Craigslist. These were in the pile.

https://i.imgur.com/ABR413v.jpg

He said that the bars are wooden dowels, painted black. The frames are 2x4's.

I have a couple of ideas but I'll keep them to myself for now.

Guessing: Crawl space doorways that also prevents critters from entering the crawl space. One each side of the home to allow for ventilation.

Otherwise, no clue.
Sonny