So why would you want a handyman to install screening on exterior vents, such as a dryer vent? To keep things out that you don’t want to get inside your house. It’s not even so much as getting in your house as getting in the vent. Things like rodents and other pests love small areas that they can climb into and get shelter and warmth. On a cold day, I’m sure a nice warm dryer vent is quite the place for a rodent to hang out. It’s also not a place where you want bees to build a hive.
Many vent terminations have screens already installed for this reason, but plenty of home inspectors find otherwise. And that is where some metal mesh will save the day. You can buy this type of screen at most home centers where they sell chicken wire. You don’t want chicken wire though as the holes in it are too large. You can buy the mesh with openings of approximately ¼” x ¼”. Take a quick measurement of the opening in the vent and cut the mesh large enough so that you can wrap it over the ends of the vent and screw it in. You can use self tapping screws with pan heads. These large heads will allow you to tighten the screw as the head of the screw holds the mesh to the vent.