Reddit reviews Accord AMAGCOV815 Magnetic Vent Cover, 8-Inch x 15-Inch, 3-Pack
We found 4 Reddit comments about Accord AMAGCOV815 Magnetic Vent Cover, 8-Inch x 15-Inch, 3-Pack. Here are the top ones, ranked by their Reddit score.
Works with ceiling and wall registers; Not for use on return air grillesSticks to steel registers only; Not for use on aluminum, painted, plastic or wood registersCuts easily with scissors for a custom fitRegister face plate not to exceed 14" X 6"Must cover the entire surface of the register face plate to adhere properly
https://www.amazon.com/Accord-AMAGCOV815-Magnetic-8-Inch-15-Inch/dp/B0052EB648
If you are dead-set on using tape, then taping to a panel of corrugated cardboard, foam board or masonite board cut to fit the tile will save the rest of the tile finish. A $1 can of Lowes white spray paint will go a long way to fixing the current appearance of the tile.
But go with a magnetic vent cover:
There are box-type magnetic vent covers that will (if sized to the vent) fit over the louver-adjusting lever and seal well, or you can pop off the grill and remove the louver mechanism so that you have a flat surface to seal with the sheet-magnet cover.
Amazon. Magnetic Vent Cover
Cut these to size and don't forget to remove them before use. You do mean to cover when it not on, yeah?