Derek Cole warns that dryer sheets in air vents are a fire hazard. The sheets are highly flammable and a spark or heat source can ignite them, potentially causing a house fire. Fix the actual odor source instead of masking it.
Chapters
What are you doing? Dryer sheets are not made to go in the air vents. They're made to go in the dryer. There's nothing on the label that says, put me in the air vents. It's not made to be there, and it's dangerous because they're flammable. A spark or anything hits that dryer sheet, it's like kindling. It's gonna light up. You don't want that to happen in your home. I know they smell good. I know you could have the house smelling good, but what is causing the smell to happen in your home that you need dryer sheets in your air vents? Find out what the smell is. Attack it at the source and leave the dryer sheets in the dryer.