If it were only that simple. We have cats and that takes dust and debris to a whole new level. 
The funny thing is I have always kept my computers on the floor and have never had any problems with dust.
But then I don't spend a lot of time cleaning and dusting my house.
My partners mother on the other hand is constantly cleaning her house and dusting and her computers always get chock full of dust....
So simple solution.... put it on the floor and stop cleaning your house![]()