Construction Performance Guidelines
NOISE CAN BE HEARD AT REGISTER
Floor registers and cold air return grilles shall be installed to prevent rattling.
One-Year - Work and Materials. Damage resulting from improper maintenance, or from additions, deletions or alterations made by the homeowner is excluded from the statutory warranty.
Floor registers or cold air return grilles not meeting the acceptable condition shall be repaired.
The sound of air movement at floor registers or cold air return grilles is normal, but they should not rattle under normal use. See Also: 8.11 NOISY DUCTWORK