The plenum rated GB-AVSTOR4 replaces a standard 2 x 2 ft. false ceiling tile, with a perforated lid that looks like a standard HVAC return register when closed. The GB-AVSTOR4 is plenum rated and permitted to be installed within environmental air spaces, based on ETL testing in compliance with the UL standard 2043. It extends the lower room area into the ceiling and is sealed to the plenum space above the ceiling tiles to avoid plenum-related building code issues. Contains covered dual knockouts, four suspension points to secure in place and eliminates the need for an AV rack in the room.