Thank you for your question. No, these mini louver vents are not WUI rated.
There is no screen
Thank you for your inquiry. Our Mini Louvers have louvered openings that are smaller than 1/8” when new from the box. A Google search on the subject yielded an answer that bees can get through openings larger than 1/8” (.125”). I add “when new from the box” because it would be possible to pry open the louvers to an opening larger than 1/8” on some of the larger size mini louvers. Once the louvers have been compromised and the louvers are no longer in their “normal new” state, then it could be conceivable that a bee could get through, but not likely.
Thank you for your inquiry. This mini louver has 0.47 sq. in. net free vent area.
No, this unit has a collar around it.
Thank you for your recent inquiry with The Home Depot. Because this item is only available in Home Depot stores, I believe the best advice would be to talk to one of our Building Material Department professionals at your local Home Depot store. For any other questions, please visit your nearest local Home Depot store or call us at HomeDepot.com Customer Service 800-430-3376. Thank you for shopping Home Depot.