LF
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Linear slot diffuser LF Description Linear slot diffuser for ceiling installation. Each slot houses inside a pair of fins conjugate which, suitably oriented, allow horizontal launches with Coanda effect (unilateral or bilateral) or vertical. It is commonly installed on the ceiling, typically in proximity of windows. Characterized by limited pressure drops, it is well suited for installation in classic or modern style environments where it blends in easily, thanks to the simple and elegant design. Available with anodized aluminum frame (LF, with aluminum fin painted black) or painted white RAL 9010 aluminum (LFW, with aluminum fin painted white RAL 9010). The version without wings, used for intake, can be combined with LC or LF supply diffusers to maintain aesthetic uniformity. Dimensions Nominal length (L) : 1000, 1500, 2000 mm* Number of slots (N) : 1,2, 3, 4 * different lengths on request Construction Extruded anodized aluminum frame (LF), natural aluminum painted (LFW). Painted extruded aluminum fins. Fins support of plastic material. Finish Anodized aluminum, with black fins (LF). White RAL 9010 gloss, powder-coated polyester type, with white fins (LFW). On request other combinations are possible, even with specific RAL. Other versions LFR: as LF but without internal deflectors (for exhaust). LFSB: as LF but without lateral frame, for builtin plasterboard installation. LFSBR: as LFSB but without internal deflectors (for exhaust). LF PF: as LFR, with plenum, removable filter and tilting diffuser (only 3/1000 and 4/1000) N _Sv_^dLwa _600_58_9,3_51 qv air flow per meter (L = 1000 mm) DP pressure drop d distance from the wall (h, = 2,7 m) Lwa sound power level (ref. 10-12 W) 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 Specifications Linear slot diffuser for ceiling installation. Internal deflectors for vertical or horizontal launches with Coanda effect. Construction in anodized aluminum or RAL 9010 white painted aluminum. Accessories PLS-LF: standard plenum with adjustable damper* PLI-LF: insulated plenum** with adjustable damper* ANGLF: angular component for 90° element composition CT-LF: counterframe for LF * from ambient ** internal insulation in polyurethane sp. 6mm, cl.1

Linear slot diffuser LF Mounting diagram The assembly diagram foresees the installation of the plenum to the ceiling and, successively, the fixing of the diffuser to the plenum; positioning the flaps fully open (vertical flow), you can access the screw seats on the diffuser and secure it through the brackets on the plenum. Counterframe CT-LF: counterframe for LF, for plasterboard false ceilings 12.5 mm thick; fixing through screws. The composition involves the use of 2000 mm pieces at the center and elements of different lengths at the two ends, according to the following rules (nominal...

Linear slot diffuser LF Plenum Plenums are equipped with single inlet for L = 1000 mm and a double inlet for L = 1500 mm and L = 2000 mm. On request different versions are available. 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

Linear slot diffuser LF Launch configuration By positioning the flaps inside the slot, and using the reference notches, you can obtain the following geometry diffusion patterns: pag. A-65 2) Two-sided diffusion with Coanda effect (tangential exhaust) 1) nilateral diffusion with Coanda effect (tangential exhaust) The fins are arranged as in the picture, so as to generate the launch in opposite directions. The vein adheres to the ceiling and the walls, and then enters the area conventionally occupied with a residual speed that must be that of the project. The fins are arranged as in the...

Linear slot diffuser LF It’s the standard factory configuration, suitable for attaching the diffuser to the plenum, and guarantees maximum vertical penetration. The fins are arranged as in the picture, so that the vertical fluxes form a single flow directed downward. Configuration without fins, for extraction (LFR). LFSB Version without side frame is available for installations on plasterboard recessed 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

Linear slot diffuser LF Performance: horizontal discharge monolateral (L = 1000) N= 1 Distance between the center of the diffuser and the wall to which the jet flows Air flow rate for single diffuser Installation height LWA Sound power level weighed “A” (rif. 10-12 W) Pressure drop At qv air-flow requested, with admitted the sound power level LWA, from diagram 1 determine the number of slots N. At qv air-flow requested and in function of the installation height, from diagram 2, determine the minimum distance d between the center of the diffuser and the wall to which the jet flows. At qv...

Linear slot diffuser LF Air-flow calculation Because of the possible inhomogeneity of distribution introduced from the plenum, it is appropriate to place the velocity probe for the measurement of vk in at least four points equally spaced on the exhaust side for L = 1000 mm, 6 for L = 1500 mm, 8 for L = 2000 mm. It must employ hot-wire anemometers taking care to position the probe as in the picture and to orient the “window” in parallel to the side considered, ie in the direction of flow. At each point it is to be measured the average velocity in a range of at least 1 minute (averaged over...