What I did was unscrew the register grills from the sealing and seal the gaps where the ceiling and the metal boot meet with duct sealent then put grills back up because the attic fan just sucks the conditioned air right out the attic least path of resistance it was easy to do and noticed better cooling throughout the house you can buy the sealent at lowes. you would be surprised at the difference the installer dosent have the time to do this or does not care.
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