CONTENTS Single deflection grilles 2 Double deflection grilles 3 Quick selection table 4 Grilles for circular ducts 10 Quick selection table 11 Information of general interest 16

Single deflection grilles (SUPPLY) Description Type 20-SH aluminium grilles, adjustable blades. Type 21-SH steel sheet grilles, adjustable blades. Finishes Anodised aluminium in its natural colour. Steel sheet painted in white RAL 9010. Special finishes available upon request. Dimensions for use with mounting frame When the grilles are fixed with a metal frame, the size of the opening corresponds to the nominal size of the grilles. For example, a grille of 500 x 300 would require an opening of the same dimensions. Dimensions for screw mounting When the grilles are fixed with screws, the size...

Double deflection grilles (SUPPLY) DV Description Type 20-DH aluminium grilles, adjustable blades. Type 21-DH steel sheet grilles, adjustable blades. Finishes Anodised aluminium in its natural colour. Steel sheet painted in white RAL 9010. Special finishes available upon request. Dimensions for use with mounting frame When the grilles are fixed with a metal frame, the size of the opening corresponds to the nominal size of the grilles. For example, a grille of 500 x 300 would require an opening of the same dimensions. Dimensions for screw mounting When the grilles are fixed with screws, the size...

General information Example: Requirements: Air flow rate:_ Sound level:_ Required pressure loss: Effective velocity: Solution: With the selection table for supply grilles and following the general criterion that for comfort installations the discharge velocity of these grilles will be between 2 and 3,5 m/s, we obtain: Vk (Effective velocity): X (Throw):_ Observing the results, the data obtained fullfill the requirements of the project. Correction factors for throw. Some correction factors exist as a function of the ratio between room width and length, the blade deflection angle and the distance...

2. Maximum recommended velocity in occupied zone. Due to the difference in the temperature of the air in the room with respect to the cold supply air, the following maximum velocities Vz are recommended (see following Useful! recommendations 1. Maximum distance h max. To obtain an adhering jet with cold air, it is advisable not to exceed the distance of the grille with respect to the ceiling (h max.) and the temperature difference At (difference between room and supply air temperature) according to the following table. For supply grilles with a nominal area higher than 0,35 m2 the Ak will be...

Accesories and mounting Type MM Metallic frame for grille mounting. Screw mounting Placing the grille in the opening, it can be screwed directly onto the wall, sheet duct, etc. For mounting in fibre ducts it is recommended that the metallic mounting frame MM is used. Fixing with mounting frame-clips Once the metallic frame is located into the wall opening (fasteners are incorporated in the frame), the grille can be placed. Pressing lightly the grille will be attached perfectly to the mounting frame by means of pressure clips. Note: The mounting frame is always provided with drilled holes, offering...

The volume control damper 29-0 modifies the values of sound level and pressure loss given in the selection tables. Hereafter, and in the corresponding graph sound levels and total pressure losses (APt) are presented for the grille including the volume control damper as a function of the parameters Vk (effective velocity) and percentage of opening of the damper (min, 1/2, max.). The graph expresses sound level NR as sound power level (without room attenuation) for the combination of grille and damper 29-0. The value of Vk in the graph is that for the grille without damper. A correction factor...

Grilles for circular ducts (SUPPLY) Description Type 21-SVC. Grilles of steel sheet for circular ducts with adjustable blades. Finishes Steel sheet painted in gray colour. Special finishes available upon request. Dimensions See table of dimensions on page 15. The dimensions of the opening are always L-5 mm x H-5 mm. For a grille of nominal size 425 x 225, the opening will have to be 420 x 220 mm. Mounting Always by screwing onto the duct. Duct diameter from 400 to 1400 mm. (See table of dimensions on page 15) Double deflection, DVC Series, grilles of steel sheet Single deflection, vertical blades...

Series 20.1Quick Selection Table (DOUBLE DEFLECTION) Q

General information Explanatory notes on the table - This selection table is based on full-scale laboratory tests in accordance with standards ISO 5219 (UNE 100.710) and ISO 5135 and 3741. These tests have been performed with supply grilles 21 DVC. To calculate the values for the single deflection grilles 21 SVC the correction factors as given in the table should be applied. - The ATU (Air Terminal Unit) is placed in the center of the room with a free jet. - The blade angle is 0° both in vertical as in horizontal (see fig. 16 for correction factors for other blade angles). - The difference in...

13 Table of general dimensions L x H (mm) (0) Circular dict diameters Single deflection SVC with damper RFS-06Double deflection DVC with damper RFS-05

Series 20.1 Induction effect It is possible to determinate the air flow rate induced in the room by means of the so-called induction factor qx/q0 which is defined by the parameters Xc in m (corrected throw) and the discharge area in m2, according to the following figure. Volume control dampers RFS-06 and RFS-05 for grilles for circular ducts series 21 (21 SVC AND 21 DVC) The dampers RFS-06 and RFS-05, connected to the grilles for circular ducts, modify the values of sound level and pressure loss presented in the selection table. In the following graph sound levels and total pressure losses (APt)...

Usefull recommendations Measurement of air flow rate The air flow rate (qv) is obtained from the product of the effective area of the grille (Ak) and its effective velocity (Vk): qv (m3/h) = Ak (m2) · Vk (m/s) · 3600 The values for both Ak and Vk are specified in the selection table. To obtain Vk use is recommended of a probe Alnor 2220 or 6070 P. If a hot-wire anemometer is used (e.g. type TSIVELOCICALC), the velocity obtained should be multiplied by 1,3. Measurement with probe Alnor General information Due to the simple construction of the damper RFS-06 and RFS-05 (sliding type), they offer...