Why blow when the vac probably got it all?Then shop vac.
Then open everything up and leaf blow.
I still can't imagine that what's blown all goes out the windows.
RonP had his coop pressurized enough with two blower motors that it did all go out a couple open windows. https://www.backyardchickens.com/articles/dust-no-more.68161/#ams-comment-511298
I went in, two big hens were having a fine dust bath on the poop boards. They were both rather unceremoniously tossed out the door.
I hate it when they do that!
Why I keep the PDZ in a thin layer.