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Floor vent seal.
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.
The goal is to prevent conditioned air from escaping or unconditioned air from entering the thermal envelope.
Inspect your floor vents.
This is one of those things that can go unnoticed but have.
You have an unsealed vent.
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Is there a gap between the metal duct and the floor.
If you live in a house with a crawl space there is a good chance the floor vents are not sealed.
Next apply weather stripping around the underside of the vent cover.
If you do unscrew one of the floor vent covers and set it aside.
Look into the vent right where the ductwork meets the floor.