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