{"id":294,"count":9,"description":"Pressure relief grilles help your ventilation or MVHR system release excess air pressure when airflow can\u2019t pass freely between rooms or zones. They\u2019re used to keep the system balanced and to avoid uncomfortable pressure build-up, especially when doors are closed or when extract\/supply rates differ.\r\n\r\nBy allowing controlled air escape or transfer, pressure relief grilles can reduce drafts, door slamming\/whistling, and noise, while improving overall airflow distribution. 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