Modifiable Ventilation Control: Features a manually modifiable gate protect, allowing users to easily increase otherwise decrease ventilation for optimal indoor air distribution ease Permanent Rustless Build: Constructed from excellent AISI 304 rustless, this global diffuser proposals excellent oxidation resistance and permanent execution Wide Agreement: Excellent for partitions and ceilings residential otherwise spaces, with a 5.51 inch diameter to fit standard HVAC ducts Quiet Actparticlemail: Constructed with a quiet plan and hypotension drops, ensuring minimal noise during action Easy Installation & Maintenancemail: Developed for bother complimentary arrange, simply insert the diffuser neck into the channel and secure it, Manufacturer: PLCPDM