CONTENTS Circular diffusers 43 SF 2 Quick selection table 3 Quick selection table 10

Circular diffusers 43 SF Description Type 43 SF with multiple cones, positioned in one plane aligned with the ceiling. Finishes Anodised aluminium in its natural colour. Special finishes available upon request. General dimensions See page 4 43 SF + PM Circular diffuser with mounting bridge for fibre ducts. Circular diffuser with mounting bridge for sheet ducts. 43 SF + 49 MM + PM and 43 SF + 49 MM + PMC Circular diffuser with flap damper and mounting bridge. The volume control damper is operated through the diffuser. H is the maximum height of the diffuser with the damper fully open. Series,...

Notes: - This selection table is based on full-scale laboratory tests according to standards ISO 5219 and ISO 5135 and 3741. - The diffuser is placed in the centre of a square room. - The jet is adherent, i.e. the diffuser is mounted aligned with the ceiling. - Room height is 3 ± 0,5 m. - Sound index NR is based on sound power, without room attenuation and without damper (mounting according to ISO). - To obtain the pressure loss or sound level of diffuser 43 SF with damper, see the corresponding graph on page 13. - Throws given correspond to a terminal velocity (Vz) of 0,25 m/s in the occupied...

General information General dimensions Symb°|s 0 N = Duct diameter in mm 0 A = Exterior neck diameter of diffuser in mm 0 B = Diameter of opening in ceiling in mm 0 C = Total exterior diameter of diffuser in mm H = Maximum height of the diffuser with the volume control damper fully open Example of selection Requirements Air flow rate:300 m3/h Throw: 1,3 to 1,6 m Sound level:below 20 NR Application:Offices Required pressure loss:below 10 Pa Solution With the selection table for diffusers type 43 SF and following the general criterion that for comfort installations the recommended discharge...

1. Maximum distance of diffuser to ceiling. To obtain an adhering jet with cold air, it is advisable not to exceed the distance of the diffuser with respect to the ceiling (h max.) and the temperature difference At (difference between room and supply air temperature) according to the following table.

Circular diffusers 44 SF and 45 SF Description Type 44 SF with core adjustable by rotation. Finishes Anodised aluminium in its natural colour. Special finishes available upon request. General dimensions See page 11. 44 SF Circular diffuser with core adjustable in height. 44 SF + PM Circular diffuser with mounting bridge for sheet ducts. 44 SF + 49 ML + PM Circular diffuser with flap damper and mounting bridge. The volume control damper is operated through the diffuser.

44 SF + 49 MO (Sizes 4 to 12, 0 100 to 315) Circular diffuser with volume control damper with blades connected to the central axis. The volume control damper is operated through the diffuser. 44 SF + 49 MO (Sizes 14 to 24, 0 355 to 630) Circular diffuser with volume control damper with multiple blades connected to the central axis. The volume control damper is operated through the diffuser. Without indication, not incorporated Volume control damper with blades Volume control damper with multiple blades Without indication, not incorporated Mounting bridge for fibre ducts Mounting bridge for sheet...

Description Type 45 SF with removable core, adjustable in two positions. Finishes Anodised aluminium in its natural colour. Special finishes available upon request. General dimensions See page 11. 45 SF Circular diffuser with removable core, adjustable in two fixed positions. 45 SF + 49 MM + PM Circular diffuser with blade damper and mounting bridge. The volume control damper is operated through the diffuser. 45 SF + 49 MO (Sizes 4 to 12, Ø 100 to 315) Circular diffuser with volume control damper with blades connected to the central axis. The volume control damper is operated through the diffuser....

45 SF + 49 MO (Sizes 14 to 24, 0 355 to 630) Circular diffuser with volume control damper with multiple blades connected to the central axis. The volume control damper is operated through the diffuser. Series, aluminium diffuser Without indication, not incorporated Volume control damper with blades Volume control damper with multiple blades Without indication, not incorporated Mounting bridge for fibre ducts Mounting bridge for sheet ducts Mounting system Identification This type of diffuser is ideal for installations with hot or cold air. For cold air the cones are placed in the lower position,...

Series 40.1General information General dimensions _2000 m3/h _3 to 4 m _below 30 NR Public building hall _below 15 Pa Example of selection Requirements Air flow rate_ Sound level_ Required pressure loss_ 0 N = Duct diameter in mm 0 A = Exterior neck diameter of diffuser in mm 0 B = Diameter of opening in ceiling in mm 0 C = Total exterior diameter of diffuser in mm D = Width of the exterior ring of the diffuser in mm E = Height of the diffuser in mm F = Distance from core in lower position to the reference level in mm G = Distance from core in upper position to the reference level in mm H = Maximum...

Series 40.1 Useful recommendations 1. Core position 2. Maximum distance of diffuser to ceiling. 4. Flow rate measurement The air flow rate (qv) is obtained from the product of the effective area of the diffuser (Ak) and its effective velocity (Vk), measured with a probe type ALNOR 2220 or 6070P and with the cones in intermediate position: qv(m3/h) = Ak(m2) • Vk (m/s) • 3600 If a hot-wire anemometer is used (e.g. type TSIVELOCICALC), the velocity obtained should be multiplied by 1,33. Measurement with Alnor probe

Series 40.1 5. Induction effect It is also possible to obtain the air flow rate induced in the room from the so-called induction factor (qx/qo) which is determined by the parameters Xc in m (corrected throw) and the effective discharge area A in m2, according to the following figure. Technical data The volume control dampers modify the values of sound level and pressure loss given in the selection table. Hereafter, and in the corresponding graphs sound levels and total pressure losses (APt) are presented for the diffuser including the volume control damper as a function of the parameters Vk (effective...