The plenum rated GB-AVSTOR3 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-AVSTOR3 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 multiple knockouts for flexibility when running power or signal cables and a quick-locking cable system for a fast and secured installation.