Bests & Worsts Reviews from Amazon

I don’t know what the deal is, but my sister kept the heater on incinerate all winter. My room is closest to the furnace so it was seriously like a billion degrees, just miserable. The vent is adjustable but the “closed” position just reduced airflow and created this awful, LOUD whistling sound so that didn’t work for me at all; tried opening windows but I swear it just drew the heat across me and it definitely made it stay on longer. I saw this product, reasonably priced for a three pack so I ordered it. The next day I popped off the vent, installed the cover, and reinstalled the vent in minutes. When my sister got home and used her pitchfork to invoke a fiery hell, this little wonder kept the inferno at bay so I was free to relax. Worth every penny.