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Floor vent seal.
The good news is that an alternative method of cleaning and sealing air ducts exists.
To properly seal around air vents apply caulk or expanding foam between the ducting and the sheetrock.
While it certainly is possible to abandon the under slab ducts and to put ducts in soffits or an attic this.
You have an unsealed vent.
The goal is to prevent conditioned air from escaping or unconditioned air from entering the thermal envelope.
Is there a gap between the metal duct and the floor.
This is one of those things that can go unnoticed but have.
Look into the vent right where the ductwork meets the floor.
If you live in a house with a crawl space there is a good chance the floor vents are not sealed.
Seal360 magnetic vent covers 3 pack pockets for complete seal 5 5 x 12 white for floor wall or ceiling vents and air registers for rv home hvac and ac vents vent not included.
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.