It seems to pull good.
I'm going with a trash bag in a trash can.
Makes me mad I found the best thing for a grate at 1/4 the price..
I think I could make this for about $45- $50 US.
Don't need to.....
It's hard to see but when I made this I took the front and rear grills off the fan and discarded them.
I took a pair of tin snips and cut off the fan blades. Then I took a 4" grinder and ground down 2 notches on fan hub edge. (see drawing)
Then I got a piece of steel that is 1/16" thick and 16" long . Drilled a hole in the center to clear a knob in th fan hub.
You can see where i offset the mounting screws to make the steel blade turn slightly to make it like a fan blade when I mounted it to the hub (see picture)