To properly seal around air vents apply caulk or expanding foam between the ducting and the sheetrock.
Floor vent seal.
Next apply weather stripping around the underside of the vent cover.
The goal is to prevent conditioned air from escaping or unconditioned air from entering the thermal envelope.
This is one of those things that can go unnoticed but have.
This will further improve efficiency and prevent energy losses.
You have an unsealed vent.
Check to make sure you have a crawl space and that you have air vents coming up through the floor.
If you do unscrew one of the floor vent covers and set it aside.
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The good news is that an alternative method of cleaning and sealing air ducts exists.
While it certainly is possible to abandon the under slab ducts and to put ducts in soffits or an attic this.
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Look into the vent right where the ductwork meets the floor.