If things seem to disappear down the floor vents in your home, then these screen nets will be a godsend. They’re made of a fine net material and come with stretchers to allow for maximum airflow while catching easy-to-fall things like jewelry, crumbs, and money. “These fit perfectly under my vent covers so they catch anything that may fall into the vent. When I moved into my new home, I had to clean the vents as dog food have collected in the vent hole!! “They do not interrupt the air flow at all and you can't even tell that they're there.”