Supply grille for circular duct BZC Description Supply grille with double row 20 mm pitch for mounting on circular duct. Individually adjustable louvers, vertical row visible (room side). Sliding damper adjustable from the environment. Mounting with screws visible on the front. Represents the typical diffusion solution with visible circular duct. Dimensions B (mm) : 400, 500, 600 H (mm) : 80, 120, 200 Construction Galvanized steel frame and anodised aluminum blades (BZC), painted galvanized steel frame and painted aluminum blades (BZCW). Finish Galvanized steel and anodised aluminum (BZC), glossy white RAL 9010 (BZCW) Description Supply grille with double row 20 mm pitch. for mounting on circular duct. Sliding damper adjustable from the environment. Mounting screws through the front sight. Construction in galvanized steel (frame) and anodised aluminum (blades). dP pressure drop (with open damper) X02 isothermic horizontal throw (isotachy 0,2 m/s) 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 - [email protected]

Supply grille for circular duct BZC Hight installation distance between the grille and the wall to which the jet flows distance between the upper edge of the grille and the ceiling X0,2 horizontal isothermal free throw (isotachìa 0,2 m/s) pressure drop LWA A-weighted sound power level “A” (rif. 10-12 W) 1 At the requested volume qv, with the admitted level of sound power LWA, determine the dimension BxH that the grill must have from diagram 1 (by excess) 2 At the requested volume qv, with the dimension BxH determined at point 1, from diagram 2 determine the free throw X0,2. 5 Where appropriate,...

Supply grille for circular duct BZC Correction factors The natural divergence of the flow is about 12 °. If necessary, appropriately orienting the fins, you can get a reduction in flow. Rotated 45 °, half in one direction and half in the opposite direction, you get a reduction of flow of about 25%. Air flow calculation A classical approach with the measure of velocity vk is not possibile, this because the velocity distribution on the outlet section depends strongly on the position of the damper : it is appropriate to use cross measures upstream and downstream the duct. F.C.R. SpA - Via E. Fermi,...

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 - [email protected]