Supply air unit DYBA. Specifications. Connbox. Quick Selection DYBA, without slot, 1:3 plenum box ATTC (50 Pa)

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1 DYBA is a quiet, ceiling-mounted supply air unit that consists of a nozzle diffuser, DYBH, and an insulated plenum box, ATTC. The nozzles of the diffuser produce a swirl pattern, which provides a highly effective mixing of the supply air with the air in the premises (high induction rate). This in turn provides an excellent indoor climate even when the temperature of the supply air is appreciably below the room air temperature. The nozzle diffuser DYBH, with the nozzles made out of the front plate by bending, has a fixed pattern of diffusion. The number of nozzles depends on the connection size of the diffuser. For confined spaces, the plenum box ATTC is available in a low-profile version. The nozzle diffuser DYBH is also available without the plenum box ATTC. DYBH is suitable for both suspended ceiling systems and false ceilings built on site. With the nozzles not protruding from the front plate, the diffuser can be mounted flush with the ceiling when using the 0 mm slot. For larger air volumes, the diffuser slot can be set at 12 mm. Quick Selection DYBA, without slot, 1:3 plenum box ATTC (50 Pa) Supply air unit Diffuser Connection ATTC Air flow l/s at sound level DYBA- DYBH- inlet mm outlet mm 25 db(a) 30 db(a) 35 db(a) DYBA, without slot, 1:2 plenum box ATTC (50 Pa) Supply air unit Diffuser Connection ATTC Air flow l/s at sound level DYBA- DYBH- inlet mm outlet mm 25 db(a) 30 db(a) 35 db(a) Specifications Easy to install and adjust Low sound level Air slot for larger air volumes 6 sizes All connection sizes are available for suspended ceiling systems Also available with CleanVent coating Connbox Measurement and adjustment damper easily removable without disturbing the setting K-factors on measurement hoses Product code example Bundle code: Ordering codes: Nozzle diffuser DYBH-315 Plenum box ATTC = outside working area 1 (8) Specifications are subject of alteration without further notice.

2 Air flow, throw, pressure drop, sound level without slot, 4-way diffusion Thow (isothermal) Sizes in the diagram below refer to air diffuser connection in mm. DYBA [DYBH ATTC ] DYBA [DYBA ATTC ] DYBA [DYBA ATTC ] DYBA [DYBH ATTC ] DYBA [DYBH ATTC ] ---- Min. airflow required to obtain sufficient measuring pressure. 2 (8) Specifications are subject of alteration without further notice.

3 Air flow, pressure drop, sound level without slot, 4-way diffusion DYBA [DYBH ATTC ] DYBA [DYBH ATTC ] DYBA [DYBH ATTC ] DYBA [DYBH ATTC ] DYBA [DYBH ATTC ] DYBA [DYBH ATTC ] ---- Min. airflow required to obtain sufficient measuring pressure. Fläkt Woods 9264 GB (8) Specifications are subject of alteration without further notice.

4 Air flow, pressure drop, sound level Supply air diffuser DYBH without slot, 4-way diffusion Air diffuser DYBH 4 (8) Specifications are subject of alteration without further notice.

5 Sound power level Lw without slot, 1:3 plenum box DYBA- Correction of sound level K (db) without slot, 1:2 plenum box DYBA- Correction of sound level K (db) Air diffuser DYBH without slot DYBH Correction of sound level K (db) Sound power levels by octave bands are obtained by adding to total sound pressure level L p10a, db(a), the correction K oct presented in the table according to the following formula: L w = L p10a + K oct Correction K oct is average value in range of use of the device. Sound attenuation ΔL without slot, 1:3 plenum box DYBA Sound attenuation (db) without slot, 1:2 plenum box DYBA Sound attenuation (db) Air diffuser DYBH without slot DYBH Sound attenuation (db) The average sound attenuation ΔL from duct to room including the orifice attenuation on the connecting duct in ceiling installation, is obtained in the table above. More technical data can be found in our product selection program. Contact our nearest sales office for further information. 5 (8) Specifications are subject of alteration without further notice.

6 Dimensions and weights Plenum box ATTC Nozzle diffuser DYBH s = 0 or 12 mm Size ØD1 ØD2 Opening Weight [mm] [mm] [mm] [kg] Size ØD1 ØD2 H L B K Weight [mm] [mm] [mm] [mm] [mm] [mm] [kg] , , DYBA G1min G1max G2min G2max [mm] [mm] [mm] [mm] (8) Specifications are subject of alteration without further notice.

7 General Execution and function DYBA is a ceiling-mounted supply air unit that consists of a nozzle diffuser, DYBH, and a plenum box, ATTC. The swirl pattern produced by the nozzle diffuser provides a highly effective mixing of the supply air with the air in the premises (high induction rate). This in turn provides an excellent indoor climate even when the temperature of the supply air is appreciably below the room air temperature. The nozzle diffuser DYBH, with a fixed pattern of diffusion, has its nozzles made out of the front plate by bending. For larger air volumes, the diffuser can be set to provide a 12 mm slot. The plenum box ATTC has a combined measurement and adjustment damper with very low noise generation. The patented multipoint measuring of the measurement and adjustment damper enables balanced and accurate values. The adjustment handle of the measurement and adjustment damper has a position indicator and a locking device. The measurement and adjustment damper can be easily dismantled for inspection and cleaning without changing the setting of the damper. The plenum box is insulated (polyester fibre) or uninsulated and its air tightness class is C. Material and surface finish Both the diffuser and the plenum box are made from steel sheet. The diffuser is powder-coated for a high surface finish and good impact and scratch resistance. Standard colour is white (RAL 9010). Other colours and CleanVent coating are available on special order. Installation, adjustment and maintenance Detailed instructions for installation, adjustment and maintenance can be found in our technical instructions that are delivered with every product. The instructions are also available on the Internet at Technical data and design For complete dimensioning details, please see Fläkt Woods product selection program. Contact our nearest sales office for further information. Product code Supply air unit (bundle code) Supply air unit, CleanVent (bundle code) (includes diffuser and plenum box) Size (aaa) 100, 125, 160, 200, 250, 315 (duct connection) Connection box model (b) 2 = insulated 1:2 3 = insulated 1:3 4 = insulated, low 1:2 5 = insulated, low 1:3 CleanVent coated diffuser (C) Nozzle diffuser Nozzle diffuser, CleanVent Nozzle diffuser, special colour Size (aaa) 125, 160, 200, 250, 315, 400 (diffuser connection) CleanVent coated (C) Special colour (E) Plenum box Duct connection in mm (aaa) Diffuser connection in mm (bbb) Type (c) 0 = uninsulated 1 = insulated 2 = low, uninsulated 3 = low, insulated Order example Bundle code is DYBA DYBA-aaa-b DYBA-aaa-b-C DYBH-aaa DYBH-aaa-C DYBH-aaa-E ATTC-aaa-bbb-c Size indication in the code refers to the size of the supply air duct. Diffuser and plenum box are ordered separately: Nozzle diffuser Plenum box Duct connection (200) Diffuser connection (315) Plenum box version, insulated 1:3 (1) DYBH-315 ATTC (8) Specifications are subject of alteration without further notice.

8 Accessories Diffuser plate DYBZ-6-a Size of nozzle pattern (a) 4 = small (for diffuser connections Ø125, 160) 6 = big (for diffuser connections Ø200, 250, 315, 400) Includes painted diffuser plate with two safety strings and four springs. 8 (8) Specifications are subject of alteration without further notice.

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