Ceiling diffusers

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Dimensions Type A x A L x L B x B C x C (mm) (mm) (mm) (mm) 288 294 147 144 222 363 369 222 219 297 438 444 297 294 372 513 519 372 369 447 595 594 447 444 522 663 669 522 519 597 738 744 597 741 672 Aticle number: SPK-4 : A04 031 1 xxx 000 (xxx = type of diffuser) SPK-4 L x L B x B C x C A x A Options SPK-4 + D L x L B x B D: Volume control damper with counter-revolving blades. The volume control damper is supplied separately and is mounted on the diffuser by means of clips. Settings are done by means of a screwdriver after taking out the diffuser core. Article number: A04 031 2 xxx 000 (xxx = type of diffuser) RES: Plenum box with lateral connection. Available with or without insulation. RES C x C A x A © ATC
Technical data Complementary information to the selection table (see back page) • Q = air flow rate in m 3 /h. • Veff = effective air velocity between the blades of the diffuser in m/s. • L0,25 = throw in m at a terminal velocity of 0,25m/s. • ∆Pt = total pressure loss in Pa. • NR = sound level. • Throw correction factor for the distance between the diffuser and the ceiling (Ch). For adherent jets, i.e. diffuser aligned with the ceiling, Ch = 1. For free jets, with the diffuser separated from the ceiling, Ch = 1,4. • The selection table is based on laboratory tests according to standards ISO 5219, ISO 5135 and ISO 3741. • The diffuser is aligned with the ceiling. • The diffuser was placed in the centre of a square test room. • The height of the room is 3 +/- 0,5m. • The temperature difference between the supply air and the room temperature is -10°C • The NR values are based on the sound power level without room attenuation and without volume control damper. The corrected throw then is: Lc = L0,25 x Ch. • Correction factor when using a volume control damper (D). The volume control damper modifies the values of the sound level and pressure loss given in the selection tables in function of the percentage opening of the volume control damper. The correction factors are indicated in the following table: Opening 100% 50% 25% ∆P X 1,5 X 2,5 X 4,5 ∆NR + 0 dB + 4 dB + 10 dB Some additional information: • To obtain an adherent jet with cold air, it is advisable not to exceed the maximum distance between the diffuser and the ceiling (h. max.) in function of the temperature difference (∆t) (difference between room and supply air temperature) indicated in the following table: ∆t (°C) 0 6 9 12 h max (m) 0,2 0,1 0,07 0,05 © ATC • Minimum recommended velocity in the occupied zone, Vz: Due to the difference in temperature (∆t) between air in the room and the cold supply air, the following minimum velocities Vz are recommended in the occupied zone: ∆t (°C) 0 6 9 12 Vz (m/s) 0,15 0,15 0,2 0,25
Page 1: Ceiling diffusers 4 SPK- square dif

Ceiling diffusers

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