Holyoake

18 General Notes on performance charts for single or multi slot linear diffusers in this section. 1. All pressures are in Pa (N/m2). 2. Projection (throw) values in metres are based upon the performance of a one metre long active section. When only 300mm is active, the values are 0.6 times those shown. For a 3 metre long continuous length, the values are 1.8 times those shown. See table below: H : Horizontal projection : Minimum is to a terminal velocity of 0.75m/s and maximum to 0.25m/s. V : Vertical projection is to a terminal velocity of 0.25m/s. 3. Spread is the maximum width of the jet defined by the above velocities. 4. N.C. values are based upon horizontal projection from a three metre active section and a room absorption of 10dB re 10-12 watts. Vertical projection values are 11dB less than listed. 5. N.C. correction for length: 6. Figures for plenum fed diffusers are for essentially zero inlet velocity. The velocity profile is relatively uniform for the length of the active section. 7. Figures for adapter fed diffusers take account of the effect of the adapter and inlet neck on diffuser velocities which tend to be less uniform and produce a velocity profile of the shape shown in the Velocity-Throw diagram below. The 0.25m/s isovel generally shows a projection reduction at the centre of approximately 25%. Flangeless Ceiling Slot Diffuser CSDP Series - Performance Data Length mm 300 400 500 600 700 800 900 1000 1200 1500 1800 2000 2400 3000 Correction Factor 0.6 0.66 0.72 0.8 0.84 0.9 0.96 1 1.08 1.2 1.32 1.4 1.56 1.8 Length mm 300 600 1000 1200 1800 2400 3000 4500 6000 7500 9000 Supply -16 -11 -7 -6 -3 -2 0 +3 +5 +6 +8 Return -10 -7 -5 -4 -2 -1 0 +2 +3 +4 +5 Typical Plenun and Adapter Fed Velocity Profiles Diagram shows isovel envelopes for CSD19 x2 slot x 1000mm @ 118m3/s Typical Throw envelopes for CSDA adapter fed CSD section