Installed the large size Stein air ducts this evening. I opted for the larger size due to the south Texas location. Aluminum screen material was used to prevent criters from entering the cockpit. I had a piece of 2" OD plastic pipe that was left over from my central vacuum system. I formed the screen over the pipe and laid it over the exit of the NACA duct. The ducting was slipped over it and clamped in place.
