DFRA-OV Adjustable blades swirl diffusers

Oval swirl diffuser DFRA-OVModel DFRA-OV 16 Description The adjustable-blade swirl diffusers manufactured by Koolair are made entirely of steel sheet. The diffuser basically consist of the following: - Front diffuser integrated in a panel of 1200x300 that can be adapted to modular ceiling format, plaster ceiling, etc. The standard diffuser finish is white (Ral9010) with adjustable blades in black (Ral9005). Other finishes can be supplied by special order upon prior consultation with our Sales Department - Connection plenum in galvanized steel sheet with internal equalizer panel to ensure proper...

There are three basic slot arrays for the DFRA-OV model, varing from 16, 24 and 34 slots and covering a wide range of air flow rates. The three different arragements are integrated into plates of 1200x300. Fixed side entre plenum box for diffusers integrated into a rectangular plates for modular ceilings, type PF Plaque for modular ceiling

General remarks - this selection table is based on real laboratory tests performed in accordance with ISO 5135 and UNE-EN-ISO 3741 standars. - The air jet has coanda effect, or in other words, the diffuser is mounted at ceiling level. - The room height is 3 meters. - The AT is equal to 0oC. (difference between inlet temperature and ambient temperature). - The throws correspond to a maximum air velocity in the occupied zone (Vz) of 0,25 m/s. SYMBOLS USED APt Pressure drop, in Pa LWA-dB(A) Sound power, in dB(A) Air jet throw for a velocity in the occupied zone of 0,25 m/s, in m.

Technical data. Selection graphs Model DFRA-OV 16 DFRA-OV-16 1200x300 SOUND POWER & PRESSURE DROP 60 50 Maximum air velocity in the occupied area. Throw in m. for an air velocity of 0,25 m/s in the occupied zone. Total pressure drop Sound power, in dB(A)

Technical data. Selection graphs Model DFRA-OV 24 VELOCITY & THROW DFRA-OV-24 1200x300 SOUN POWER & PRESSURE DROP 60 50 Maximum air velocity in the occupied area. Throw in m. for an air velocity of 0,25 m/s in the occupied zone. Total pressure drop Sound power, in dB(A)

Technical data. Selection graphs Model DFRA-OV 34 DFRA-OV-34 1200x300 SOUND POWER & PRESSURE DROP 50 Maximum air velocity in the occupied area. Throw in m. for an air velocity of 0,25 m/s in the occupied zone. Total pressure drop Sound power, in dB(A)

Example of selection The selection graphs contained in this catalogue for the different models allow you to use the supply air flow and a maximum velocity in the occupied area (Vz) to calculate the following parameters: - Throw achieved by the air vein for a maximum air velocity in the occupied zone (Vz). - Total pressure drop and sound power level generated in the plenum-diffuser assembly. The methodology is explained below with an example: Initial data Diffuser model: DFRA-OV 24 Air flow: 325 m3/h Maximum air velocity in the occupied area: 0,25 m/s Results Bases on the graphs of page 5, we...

KOOLAIR, S.A. Calle Urano, 26 Poligono industrial nº 2 – La Fuensanta 28936 Móstoles - Madrid - (España) Tel: +34 91 645 00 33 Fax: +34 91 645 69 62 e-mail: [email protected]