Can I place outdoor screen over air vents on top of my amplifier vs. dust/hair entering?

When not in use,
I cover my amps with dust covers from Stan at radio dust covers. He makes a quality product and can sew in the manufacturers logo if wanted.

https://radiodustcovers.com/

I would think that the material that is used for stopping weeds in the landscape would work. It allows water and air to pass thru and is lightweight.  A small roll should do the trick. Very cost efficient for your experiment. 

All good suggestions. I’m thinking also 100 micron stainless steel fine mesh?

@millercarbon you crack me up. 

I am not trying to be funny, but why not use something that will actually stop dust. Instead of an outdoor screen, why not use something like pantyhose. Seriously, it allows air flow but will trap dust better. I used my wife's pantyhose as a second layer when I had to re-insulate our attic. That being said, if you use something that is actually efficient, you will have to be diligent about cleaning them or it may lead to overheating and a voided warranty.