I called this place home once, in peaceful times.

My nephew is very allergic to eggs, peanuts, tree nuts, and sesame. Last year my sister discovered all hot dogs and hamburger buns now contain sesame. Not "may contain", but listed in the ingredients. This year basically every brand of sliced bread also now contains sesame, making it very difficult to find bread items he can eat.

They're just adding it to their products, so they can just list it as an ingredient and not bother with worrying about cross contamination. And they aren't even bothering with telling anyone. Capitalism is going to kill us all.

"Which brings us back to Kellogg’s. Back in 2016, the company found a way around the added burden and expense of complying with the FSMA: they simply began adding trace amounts of peanut flour to their cracker products. Doing so allowed them to list peanuts as an ingredient of the product, freeing them from having to prevent cross-contact.

Another design is using 2 20x25x1 filters, taping them to the sides of the box fan and then to each other so they sort of make a triangle, then cutting cardboard to make a top and bottom to the triangle.

This was discovered as a more effective design during the 2020 US west coast fires.

https://tombuildsstuff.blogspot.com/2013/06/better-box-fan-air-purifier.html