Our radon outlet pipe ends in a down-facing elbow, above the 2nd story roof. When I installed it, I put a screen over the outlet, thinking to prevent bugs and birds from nesting. In recent bad weather, the screen got plugged with snow, stopping the discharge. I pulled the screen off. Now, I'm wondering whether a screen is necessary. The airflow is fairly strong, and cool in the summer, which I think would discourage bugs. Birds, ... who knows?
If anyone has experience in these matters, I'd appreciate hearing.
Thanks, George