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DRA - 3 Pages

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DRA

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Description Diffuser with 4 adjustable cones for ceiling installation. The core can be rotated to adapt to different conditioning regimens: in summer regimen, it is "unscrewed" till it protrudes resulting in a radial tangential launch (with Co-anda effect), in winter regimen it is "screwed” up till it reenters resulting in a vertical launch. It is characterised by low pressure drop related to the air-flow and is used and in civil environments for conditioning of offices, shops, hospital structures, and in industrial environments for conditioning of storehouses, exhibition areas, warehouses, supermarkets. Construction Natural painted aluminium. Finish Gloss white RAL 9010, powder-coated. Accessori DT-7E : butterfly damper (screwed justement). PLSC : standard plenum with lateral inlet. PLIC : insulated plenum* with lateral inlet. ST-DRA: pair of hanging brackets. * polyurethane internal insulation thickness 6 mm, cl.1 Specifications Adjustable cones circular diffuser for ceiling installation. Radial horizontal or vertical launch. Costruction in painted white aluminium RAL 9010 . 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

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Adjustable cones circular diffuser X0,2 Horizontal isothermal free throw (isotachìa 0,2 m/s) Dt Distance between the centre of the diffuser and the wall to which the jet flows Temperature difference (supplied air - environment setpoint) Y0,2 Vertical free throw, with Dt = 10 °C (isotachìa 0,2 m/s) DP Pressure drop LWA Sound power level weighted “A” (rif. 10-12 W) The value of d was calculated in relation to X0,2 and hi to maintain residual velocity in the occupied area within the limit of 0,20 m/s. 2 At the requested air-flow qv, from diagram 2, determine the free throw X0,2. 3 According to...

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Adjustable cones circular diffuser Vertical launch Screwing up the core until it comes back in the body of the diffuser, you obtain a vertical launch suitable for winter heating. The related diagram 5 refers in case of Dt = +10 °C . 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 Due to possible asymmetries caused by plenum and flexible duct, it is necessary to position the velocity probe to measure vk in at least 4 equally angularly spaced points. You must employ hot-wire anemometers, taking care to...

 Open the catalog to page 3

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