The small round insect screens were installed right away. However since I ordered the bigger one as a package deal I did not return the larger screen. It was very small and did not fit my waterheater vent. I decided to give it to one of the other campers at the RV park where we had our RV set up at the beach. I walked the entire park and could not find anyone with a water heater or any vent that small. Threw it in the box with other miscl leftover RV parts.