BPA 20
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Supply grille with double row pitch 20 mm BPA 20 Description Supply grille with double row pitch 20 mm. Individually adjustable blades, visible vertical row (environment side). Available both in anodised (BPA 20) and in white (BPA 20 W) version, it represents the usual solution for wall installation. Fixing through lateral pressure springs. Construction Anodised aluminium (BPA 20), painted natural aluminium (BPA 20 W). Finish Anodised aluminium (BPA 20), gloss white RAL 9010, powder-coated ployesther type (BPA 20 W). Other versions BPA 21 : double row, visible horizontal. BPA 10 : single vertical row. BPA 11 : single horizontal row. BVA ... : fixing through visible frontal screws. Accessories CB1 : regulation damper. PLSR : standard plenum with oval inlet1. PLSSR: as PLSR, with damper on inlet. PLIR : insulated plenum** with oval inlet1. PLISR: as PLIR, with damper on inlet. PL-PE: plenum with circular inlet. PLI-PE: insulated plenum** with circular inlet. CTP : counterframe for BPA CT : counterframe for BVA * back - ** internal insulation polyurethane thickness 6 mm, cl.1 Specifications Supply grille with double row pitchfor wall installation. Individually adjustable blades for control of the launch horizontally - vertically. Anodised aluminium (BPA 20) or natural painted white aluminium RAL 9010 (BPA 20 W) construction. Fixing through pressure springs. Dimensioni B (mm): 200 - 1000 (multipli di 20) H (mm): 80 - 400 (multipli di 20) F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - fcr@fcr.it

Supply grille with double row pitch 20 mm BPA 20 Due to secondary air induction, the velocity decreases getting far from the supply grille and at the same time the jet diverges. Furthermore, the presence or absence of Coanda effect, affects both jet’s divergence angles and throw reduction. Actually, you can consider approximately valid what follow : installation height distance between the supply grille and the wall to which the jet flows distance between the upper edge of the grille and the ceiling Air-flow per single supply grille X0,2 free isothermic horizontal throw (isotachìa 0,2 m/s)...

Supply grille with double row pitch 20 mm BPA 20 You must supply 500 m3/h in a room where the maximum allowed LWA is 38 dBA (corresponding to about NR 30). You want to select a proper supply grille and determine the minimum distance from the opposite wall. From first diagram you have : Ak = 0,04 m2 4 From second diagram at qv you have: X0,2 = 7,5 m From third diagram you have : d = 3 m From fourth diagram at qv you have : DP = 10 Pa F.C.R. SpA - Via E. Fermi, 3 - 20092 Cinisello Balsamo (MI) - Italy phone +39 02 61798 1 - fax +39 02 61798 300 - www.fcr.it - fcr@fcr.it From fifth diagram you...

Supply grille with double row pitch 20 mm BPA 20 Correction factors When the temperature difference Dt is different from zero, the different supplied air density compared to environment air, creates vertical deviations of the jet Dy (upstream during heating, downstream during cooling). In order to quantify them, determine first the velocity throw vk then the deviation Dy at the involved distance X. If necessary, by proper adjustement of the blades, it is possible to obtain a throw’s reduction. By 45° rotation, half in a direction and half in the opposite one, you can reach a throw’s...

Supply grille with double row pitch 20 mm BPA 20 Plenum PLSR Equipped with an oval inlet, it allows the use of hoses with a larger diameter than traditional plenums, to better use the air passage section. The inlet is made up of two semicollars in plastic material suitably shaped to facilitate the connection. The nominal diameter of the flexible duct to be used is shown in the table below. Plenum PL-PE Traditional plenum equipped with circular inlets, allows the use of hoses with a diameter smaller than the height of the grille. Suitable for solutions in which the overall dimensions are...