Vent rear view

A rear view of the Ultra CSV ® crawl space vent will show you how the backer bar, threaded rods and knurled nuts hold the faceplate into the vent opening.  Insects are normally extremely small when they are born and dearly love the cool shaded damp crawl spaces and they can work their way through cracks and crevices and to our knowledge, this is true of every vent on the market, but not with the Ultra CSV ® crawl space vent which is not cemented in.  A homeowner can remove the door and spray for such insects from outside the home if so desired.  To the best of our knowledge no other vent has this option.