*PLUMBERSSTOCK EXPERT* responded:
Hi! Thank you for your interest in our Deflecto 99 Magnetic Floor Register Air Deflector. Yes, this will work on sidewall registers, and floor registers, as well. If you're interested in purchasing the Deflecto 99 Air Deflector, click the "Add to Cart" button, enter your zip code and you'll be all set. Thank you for visiting PlumbersStock.com. Have a great day!