Check the listing for details. DUCT SQUARE CELILING Beveled Edge Diffuser (225mm~ 375mm) + Neck Adaptor. Condition: Brand New. Listed at 22.76 USD. DUCT SQUARE CELILING AIR DIFFUSER/ ALUMINUM AIR VENT DIFFUSER Product Description * Ceiling diffusers direct the air from air conditioning systems into the room. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. Ceiling diffusers allow for large volume flow rates. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone. * Square ceiling diffuser is an integrated design ,where the diffuser frame is punched and stamped in one piece with the diffuser core. The diffuser is designed to deliver air equally in all 4 directions . * 4 way diffuser is usually with damper for supply air .Damper is optional ,it fixed rigidly to the frame by aluminium rivets. Fixing by spring clips as option. * SCD-VA,SCD-VB SCD-VC are the three kinds of square air diffusers which the airflow flatly, they are straight-edge diffuser, chamfer-frame diffuser, and new type of emovable diffuser. * They are mainly used for studios, hospitals, theaters, classrooms, concert halls, libraries, recreation hall, theater lounge, general offices, shops, hotels, restaurants and gymnasium, and so on.* In order to avoid the noise interference in a variety of environment, except determine the wind speed by the neck according to performance table, it should consider the installing height and surroundings. Material :AluminiumFunction: Supply and Return AirShape:Square TypeSize: 225x225,300x300,375x375, Other sizes availableColour : RAL9010,RAL9016,RAL9003,AnodizedInstallation: CeilingFeatures: Decorate, Adjustable ,DurableAccessories; OBD,Clip,Fasten Rope Fertures: * Square diffuser frames are make of high quality extruded profile, 1.0mm thickness.* Removable core for better installation and maintenance.* Blades are make of aluminium sheet by one piece stamping or by welding.* Core is removable to allow for better installation and maintenance.* The standard nominal sizes are 225x225, 300x300, 375x375, * For supply and extract air.* For all types of ceiling systems.* For a rapid reduction of the temperature difference and airflow velocity.* Opppsed Blade damper optional,Plenum box optional. Structure: * 1 way ,2 way 3 way and 4 way air flow Specification: Neck size (mm)* Face size×(mm) 225x225 335x335 300x300 410x410 375x375 485x485 *Neck size refers to the size of the opening in the ceiling. Standard size HXL (mm)Air Volume (m3/h)Throw Max (m) 225x2252401.40300x3004001.70375x3756002.00Datas are chosen when the air velocity is 2.4m/s and the velocity at throw distance is 0.5m/s NECK ADAPTER FOR DUCT SQUARE CELILING AIR DIFFUSER Product Description Fertures: 1. This adaptor is designed for connecting the diffuser and flexible duct2. Can be used in BD series diffuser3. Advantages of easy installation, removing and maintaining4. Constructed from galvanized steel and finished in matt black inside5. Painted finish in standard colors are available to customer requirements upon request