[wdfifteen]

I had that kind on my old house and they didn't work worth spit. When they are clean they work OK in a light rain, but as you observed, they can be overwhelmed. You have to clean any mold or dirt off of them a couple of times a year. Once they are dirty they don't work at all.



When I bought them the salesman said they were guaranteed. After mine were installed and didn't work I had a supervisor come out and look at them. I told him about the guarantee. He said something to the effect of "...the materials and workmanship are guaranteed. The installation is not."
"So the only guaranteed is that they are made out of aluminum?" I asked.
"Yes, pretty much."

I had the screen kind put on my current house. They work better, but still have to be cleaned.