THX Huckleberry!
Proofs in the testing!
I'm hoping someone else with an external Rad will try this to verify my results....
You just need a container for some water; put it in front of the intake, and pop in the Mister. As I have said before; The centrifugal force created by the fan/s keeps their centre/s dry
I,m busy with CAD a.t.m. to build this into my main system with an old 50cc motorbike carb's float and Needle & Seat to keep water levels correct.
The one thing every home has is water and electricity and only a very thin pipe will have to be connected to the plumbing.
Will do some reserch into the health risk. Health risks in everything now days!

If you look hard enough theres probably a health risk in eating apples! (Climbs off soap box)
Perhaps a car air filter on the exhaust side, or a home water filter/
softener system will help?