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