Square and rectangular diffusers

CONTENTS Square and rectangular diffusers 2 Quick selection tables 3 Diffuser and accessory combinations 15 Off-standard rectangular diffusers 16 Stamped square diffusers 52-FR-4 Stamp 17

Square and rectangular diffusers 50 FR Description Type 50 FR, square or rectangular aluminium diffuser. Finishes Anodised aluminium in its natural colour. Special finishes available upon request. LxH (Nominal or duct dimensions) B (Nominal dim. - 3 mm) General dimensions C (Opening) = (L + 75) x (H+75) D (Ext.) = (L+144) x (H+144) LxH (Nominal or duct dimensions) B (Nominal dim. - 3 mm) See page 16 and 17 for sizes. Other dimensions can be found in the drawings in the left column. 50-FR-4 4 Way square diffuser. Normalised neck according to ISO standard for duct mounting. The free opening should...

Flow rate Vk = Effective velocity in m/s X = Throw in m Pt = Total pressure in Pa NR = Noise level index in dB The selection should take into account, for a given air flow rate, the noise level and the throw. The throws given in the table correspond to a maximum velocity in the occupied zone of 0,25 m/s.

50-FR-1 Square diffuser with central core in one way. 50-FR-2 Square diffuser with central core in two ways. 50-FR-2D Square diffuser with central core in two ways 90º. 50-FR-2-L Rectangular diffuser with central core in two ways. 50-FR-3 Square diffuser with central core in three ways.

Flow rate Vk = Effective velocity in m/s X = Throw in m Pt = Total pressure in Pa NR = Noise level index in dB The selection should take into account, for a given air flow rate, the noise level and the throw. The throws given in the table correspond to a maximum velocity in the occupied zone of 0,25 m/s.

Flow rate Vk = Effective velocity in m/s X = Throw in m Pt = Total pressure in Pa NR = Noise level index in dB The selection should take into account, for a given air flow rate, the noise level and the throw. The throws given in the table correspond to a maximum velocity in the occupied zone of 0,25 m/s.

Flow rate Vk = Effective velocity in m/s X = Throw in m Pt = Total pressure in Pa NR = Noise level index in dB The selection should take into account, for a given air flow rate, the noise level and the throw. The throws given in the table correspond to a maximum velocity in the occupied zone of 0,25 m/s.

Quick Selection Table (diffusers type 50 FR-2-L) Flow rate Vk = Effective velocity in m/s X = Throw in m Pt = Total pressure in Pa NR = Noise level index in dB The selection should take into account, for a given air flow rate, the noise level and the throw. The throws given in the table correspond to a maximum velocity in the occupied zone of 0,25 m/s.

Flow rate Vk = Effective velocity in m/s X = Throw in m Pt = Total pressure in Pa NR = Noise level index in dB The selection should take into account, for a given air flow rate, the noise level and the throw. The throws given in the table correspond to a maximum velocity in the occupied zone of 0,25 m/s.

Series 50 General information - The special design of the range of square and rectangular diffusers provides to any kind of space the requirements of decoration which today’s architecture demands. - The broad range of products and possibilities to orientate the air flow in 1,2, 3 or 4 ways, make them particularly indicated for spaces where a particular zone has to be treated, in geometrically irregular spaces or off-centre parts of the space (conjunction of wall and ceiling, etc.). - By means of laboratory tests it has been demonstrated that these diffusers are ideal for variable volume systems, due...

Series 50 _400 m3/h _ 1 to 1,5 m _ below 30 dB Private offices __ below 10 Pa Maximum 3m/s _4 Example Requirements: Air flow rate_ Sound level_ Required pressure loss Exit velocity_ Solution: With the selection table for diffusers type 50 FR-4 and following the general criterion that for comfort installations the recommended discharge velocity for this type of diffusers lies between 2 and 3,5 m/s, we obtain: Throw correction factor for distance of diffuser to ceiling (Ch) For adherent jets, i.e. diffuser aligned with ceiling: Ch=1 For free jets, with the diffuser separated from the ceiling: Ch=1,4 The...

3. 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 hot-wire anemometer (e.g. type TSI- VELOCICALC): qv(m3/h)=Ak (m2)·Vk (m/s)·3600 The value of Ak is obtained from the quick selection tables. E.g. for a diffuser type 50 FR-4 of size 12x12 the Ak is found to be 0,0435 m2. 4. 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...

Series 50 5. Volume control dampers 59 MM and ”O”. Technical data The volume control dampers modify the values of sound level and pressure loss given in the selection tables. 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 velocity) and percentage of opening of the damper. 5.1 Damper 59 MM A correction factor should be applied to the sound level as a function of Ak of the diffuser according to the following table.

Other accessories and mounting systems Directional grille ”G” Damper Directional grille ”G” The directional grille G is a flow guide which permits orientation of the air flow, providing more flow in some directions than in others. Positioned at 0° it acts as a flow equaliser in cases where the duct flow is not uniform. Mounting is compatible with damper O and/or mounting system SM, but not with mounting bridges (PM or PMC) or blade damper (59 MM). Mounting system ”SM” The mounting system SM consists of clips fixed to the diffuser neck, which provides pressure between the frame of the diffuser...