multicore square and rectangular diffusers

Publication DIFFUSERS section 2 SEPT 2005 PART C R Air Diffusers supply and exhaust ventilation systems multicore square and rectangular diffusers introduction The IC diffuser is a versatile form of air terminal offering the facility of multi directional throw patterns in a wide range of frame sizes. Each core style has two position settings within the frame, allowing conventional horizontal diffusion when lowered or vertical projection when raised. The cores are fitted with quick release safety cords as standard. The diffuser is available in frame styles to suit either ‘T’ bar, Clip In or Tegular ceiling systems. Nominal Size and Duct Size Ceiling Opening = Duct Size + 76 O/A Size = Duct Size + 146 Quick Release Safety Cord Spring Pin Core Retainer Damper Lever 129 85 5 IC IC/OB The performance tables show the range of standard neck sizes available. Larger sizes (in increments of 75mm) can however be supplied in most core styles to suit special requirements. A range of pan adaptors and side entry plenums can be supplied either ready fitted to the diffuser or loose. Details can be found on page 12. The standard finish is satin anodised aluminium (SAA) or White (RAL9010) powder coat (PC) but a wide range of paint finishes are also available in either BS or RAL colours, as detailed in Part I Diffusers can be supplied with neck mounted lever operated OB dampers, or alternatively, rhomboidal dampers can be specified where duct entry conditions are likely to cause a problem with flow equalisation. A number of optional accessories may be specified, including core blanking plates (where diffusers are oversized to suit the ceiling grid) and diffuser hanging brackets. Multicore diffusers SQUARE AND RECTANGULAR DIFFUSERS control sizes finish options type IC 2 Concealed ‘T’ (CT) Lay-in ‘T’ (LT) Clip-In (CI) type control option IC4 / OB / BP / 450 x 450 / 4 size quantity HB = Hanging Bracket Where the diffusers are to intergrate with a ceiling system, state whether concealed ‘T’ (CT), lay-in ‘T’ (LT), Clip In (CI) or Tegular (TC) type frame . Blanking Plate Hanging Brackets - HB Blanking Plate - BP 600 o/a 600 ‘T’ Centre 595 o/a 600 o/a Quick Release Safety Cord BP = Blank plate Multicore diffusers FRAME OPTIONS - FEATURES frame options optional features standard features options EXAMPLE : ordering details R 3 HORIZONTAL DIFFUSION Core Lowered VERTICAL DIFFUSION Core Raised Push to Release Multicore diffusers CORE SETTINGS The quick release core feature allows easy removal for damper access and also provides two positive location settings for conventional horizontal diffusion and vertical projection. 4 CORE PATTERN SELECTION PARAMETER NECK AIR VELOCITY (m/s) NECK SIZE (mm) 1.0 1.5 2.0 2.5 3.0 3.5 Pt Total Pressure (Pa) 2.5 5 8 14 20 27 150 x 150 225 x 225 300 x 300 375 x 375 450 x 450 AIR FLOW RATE (l/s) MIN MAX THROW (M) NR LEVEL 22 34 46 51 68 73 0.8 - 1.6 1.2 - 2.4 1.5 - 3.0 2.0 - 4.0 2.4 - 4.3 3.0 - 6.0 -- -- 19 22 25 28 AIR FLOW RATE (l/s) MIN MAX THROW (M) NR LEVEL 50 76 102 128 152 178 0.9 - 1.8 1.4 - 2.8 2.0 - 4.0 2.4 - 4.8 3.0 - 6.0 3.4 - 6.8 -- -- 19 23 26 30 AIR FLOW RATE (l/s) MIN MAX THROW (M) NR LEVEL 90 136 180 226 270 316 1.2 - 2.4 1.5 - 3.0 2.2 - 4.4 2.7 - 5.4 3.3 - 6.6 3.8 - 7.6 -- -- 21 25 29 34 AIR FLOW RATE (l/s) MIN MAX THROW (M) NR LEVEL 140 210 280 350 420 492 1.3 - 2.6 1.8 - 3.6 2.3 - 4.6 2.9 - 5.8 3.6 - 7.1 4.2 - 8.4 -- -- 22 27 33 37 AIR FLOW RATE (l/s) MIN MAX THROW (M) NR LEVEL 202 304 406 506 608 710 1.4 - 2.8 2.1 - 4.2 2.4 - 4.8 3.1 - 6.2 3.8 - 7.6 4.6 - 9.2 -- 19 24 30 35 39 AIR FLOW RATE (l/s) MIN MAX THROW (M) NR LEVEL 34 52 68 84 102 118 0.9 - 1.8 1.2 - 2.4 2.0 - 4.0 2.2 - 4.4 2.5 - 5.0 3.0 - 6.0 -- -- 19 23 26 29 225 x 150 300 x 150 375 x 150 450 x 150 300 X 225 375 x 225 525 x 225 375 x 300 450 x 3

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