A dryer vent with a loose or broken flapper invites drafts and mice into your house. When clogged with lint, vents not only trap moist air but also become a fire hazard. Replace that old dryer ...

pry those up as well, so you can slide the base all the way and center it on the opening. Don't worry about the shingles below the hole — the base sits on top of those. Install the vent without ...