drum jet diffusers

Publication DIFFUSERS section 2 SEPT 2005 PART F R Air Diffusers supply and exhaust ventilation systems drum jet diffusers type control finish DJ / OB / SAA / 1806 / 10 size quantity EXAMPLE : introduction controls The Brooke Air range of Drum Jet diffusers are high air capacity terminals designed for applications requiring a long jet throw. They are ideally suited for exposed duct or sidewall installations in sports complexes, atria, factory workshops and warehouses. The drum and guide vanes can be adjusted to give full jet spread and directional control, enabling the diffuser to be set up for optimum conditions in both heating and cooling modes. In addition, to promote rapid diffusion in the vertical plane and reduce jet throws, a further set of adjustable blades can be fitted across the width of the drum outlet. (Type DJD) The diffuser drum and frame are robustly constructed from anodised aluminium extrusions and incorporate brush strips to provide a low friction air tight seal. For general flow control, the Drum Jet diffuser is available with a key operated opposed blade damper, either fitted to the frame (DJ/OB) or supplied loose for duct mounting (OB/DM). For installations where the diffuser is to be mounted in a main duct wall or a stub duct, the VED type equalising deflector with individually adjustable scoop and straightening blades can be fitted to equalise the discharge velocity. (Also available loose for duct mounting VED/DM). Alternatively, the duct mounted rhomboidal damper (RD/DM) can be specified for combined flow control and equalisation. type DJ DJ diffusers are supplied as standard in silver anodised aluminium (SAA), but stove enamelled colours are also available in the BS or RAL ranges. See Part I for details. NOTE: The powder coat finish is not recommended for Drum Jets. The standard fixing method is by countersunk screw through the diffuser flange - SC. finishes fixings ordering details DESIGN FEATURES Drum Jet diffusers 2 design features Adjustable Vanes Brush Strip Seal Brush Strip Seal Adjustable Diffuser Blades DJ DJD 30O 30O DJ - DJD DESIGN FEATURES Drum Jet diffusers R 3 AIR FLOW Air Turn Adaptor Frame Stub Duct Diffuser mounted Air Turn DJ/VED 146 (size 6) 207 (size 10) 42 MAX 146 (size 6) 207 (size 10) Adaptor Frame Diffuser mounted opposed Blade Damper DJ/OB Duct mounted Rhomboidal Damper RD/DM VOLUME EQUALISING DEFLECTOR - VED Suitable for installations with short stub ducts and high air velocities in the main branch. The two sets of blades can be individually adjusted to give an even velocity distribution and can be adjusted for volume control. For easier volume control, an opposed blade damper can be supplied in addition to the VED. RHOMBOIDAL DAMPER - RD Suitable for installations with short or no stub ducts. The blade profiles can be progressively adjusted across the width of the diffuser to give an even velocity distribution at the outlet. OPPOSED BLADE DAMPER - OB General purpose damper for installations with a reasonable length of stub duct. DESIGN FEATURES Drum Jet diffusers volume equalising control options 4 DIMENSIONS (mm) WEIGHT SIZE (Kg) A B W H C D 906 300 217 261 170 36 87 1.5 1206 376 217 337 170 36 87 1.7 1806 529 217 490 170 36 87 2 2406 681 217 642 170 36 87 2.5 DIMENSIONS (mm) WEIGHT SIZE (Kg) A B W H C D 2010 579 319 540 271 63 138 5.5 2510 706 319 667 271 63 138 6.5 3010 833 319 794 271 63 138 7.0 3510 960 319 921 271 63 138 7.5 dimensions Drum Jet diffusers 75 Blade 14 C 6 D 85 (size 6) 150 (size 10) Duct Width W A B Duct Height H Duct Height H DIMENSIONS R 5 AIR FLOW RATE DRUM JET SIZE NR LEVEL JET THROW (m) To Vt = 0.25 m/s STATIC PRESSURE LOSS (Pa) l/s m3/hr 40 30 20 500 75 50 25 12 45 40 50 35 30 1206 1806 2406 906 2010 2510 3010 906 1806 2510 2406 1206 3510 2000 1000 900 800 600 500 400 3

For more information on drum jet diffusers talk to Brooke Air Sales