Attic systems may use registers placed in the ceiling instead.
Hvac floor registers seal.
This will further improve efficiency and prevent energy losses.
To properly seal around air vents apply caulk or expanding foam between the ducting and the sheetrock.
In this case their height will be determined by your system.
Since there was no previous vents new duct work is being installed.
I have observed the process and there does not appear to be a very good seal around the registers between the attic air and the house air.
Next apply weather stripping around the underside of the vent cover.
To air seal around duct boots use caulk canned foam or rigid air barrier material cut to fit and caulked or foamed in place around the duct shafts.
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Inspect your registers and vents.
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The supply vents which push air through the duct work must be placed properly.
Many have duct work in crawlspaces so the registers are placed in the floor.
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Seal any holes loose connections or leaky joints with duct mastic sealant or metal duct tape.
Unlike traditional cloth backed rubber duct tape these sealants are long lasting and provide the sealing strength you will need to stop leakages long term.
Air seal around all duct shafts and flues installed through ceilings walls and flooring to keep conditioned air from leaking into unconditioned space.