con stan t-/var i ab l e f l ow d ampe rs Constant-/variable flow dampers About Lindab Product overview / symbols Ceiling diffusers Ceiling diffusers - visible Plenum boxes Wall diffusers Displacement units Constant- / variable flow dampers Fresh air valves/overflow unit 16 Cleanroom diffusers © 02.2013 Lindab Ventilation A/S. All forms of copying without written permission are forbidden. is Lindab AB’s registered trademark. Lindab’s products, systems and product group and product designations are protected by intellectual property rights (IPR).

Constant-/variable flow dampers Product Technical data Right to alterations reserved

con stan t-/var i ab l e f l ow d ampe rs Lindabs constant-/ variable flow dampers In many instances it will be necessary to maintain a constant air flow in a room, a zone etc. In normal ventilation units, pressure variations usually for one reason or another makes it necessary to regulate the air duct system, in order to achieve the desired air flow in the right room. DAU is a mechanical constant flow damper which automatically sustains a given air flow, that is manually set on the regulation handle. DA2EU has a mounted electrical motor, which is able to switch between two previously chosen...

DAU,DA2EU,DAVU Disturbance tolerance In order to achieve the stated accuracy for the pre-set flow a straight distance of at least 3×d before and at least 1,5×d after the units are required. A mounting close to a source of disturbance (bend, saddle etc.) decreases the regulation accuracy and the flow may deverge from the set value. Summary • DAU - manual single flow unit • DA2EU - motorized twin flow unit • DAVU - motorized variable flow unit • Diameters Ø 80–315 • Flow range 15–830 l/s (54–2988 m³/h) • Pressure range 50–1000 Pa (over the unit) • Independent of mounting direction • Handles 50...

li ndab | constant -/variable flow dam per s Constant-/variable flow damper 5 Description Constant flow damper with manual setting of one flow Tightness class across closed blade The unit compensates for e.g. connection and disconnection of system parts, clogging of filters and ducts, thermal lift forces, wind effects, window opening etc. Ø 80–315 fullfills pressure class A in closed position. DAU is a constant flow damper, which facilitates balancing of ventilation systems and gives correct flow from the start. Fulfils tightness class C. There is a separate assembly, measuring, balancing and...

lindab | constant -/variable f low dampers Constant-/variable flow damper Description Constant flow damper with electric motor for switching between two flows DA2EU is a constant flow damper, which facilitates balancing of ventilation systems and gives correct flow from the start. The unit compensates for e.g. connection and disconnection of system parts, clogging of filters and ducts, thermal lift forces, wind effects, window opening etc. The motors shall be completed with a switch. The switch can in turn be controlled either manually with timer, with on/offthermostat, with attendance transmitter...

l indab | constant -/vari ab le flow dampers Constant-/variable flow damper 5 Description Constant flow damper with electric motor for continuous setting of one flow The unit compensates for e.g. connection and disconnection of system parts, clogging of filters and ducts, thermal lift forces, wind effects, window opening etc. The motor shall be completed with control signal transmitter e.g. an external potentiometer or a proportionally regulating thermostat. A special mounting, measuring, balancing and maintenance instruction exists for this product. Ø 80–315 fullfills pressure class A in closed...

lindab | constant -/variable f low d ampers Technical data Technical data Pressure and flow ranges and sound to duct The graphs show A-weighted sound power level, LWA [dB], to duct. These curvs are intended for brief comparision. For more accurate calculation, please use the tables. Example Given: Diameter Flow Pressure drop Sound power level as below Sound power level [dB] Air velocity pressure loss Volumeflow A-weighted sound power level approx. 57 dB We reserve the right to make changes without prior notice

lindab | constant -/variable flow dampers Technical data Technical data Pressure and flow ranges and sound to duct We reserve the right to make changes without prior notice

lindab | constant -/variable f low d ampers Technical data Technical data Sound to duct Sound power level, LW [dB], to duct in octave bands 1–8, 63–8000 Hz, as function of diameter, pressure drop and flow. Velocity app. 2,5 [m/s] We reserve the right to make changes without prior notice

li ndab | constant -/variable flow dam per s Technical data Technical data Sound to duct Sound power level, LW [dB], to duct in octave bands 1–8, 63–8000 Hz, as function of diameter, pressure drop and flow. We reserve the right to make changes without prior notice

lindab | constant -/variable f low d ampers Technical data Technical data Pressure and flow ranges and sound to the surroundings 2 3 The graphs show A-weighted sound power level, LWA [dB], to the surroundings. Example: Given: Diameter Flow Pressure drop A-weighted sound power level approx. 40 dB The A-weighted sound pressure level in the mittle of the room becomes approx. 8 dB lower than these graph values. With insulation shell around the unit (the DALU unit) the Aweighted sound pressure level in the mittle of the room becomes appox. 26 dB lower than the graph values on condition that also the...

lindab | constant -/variable fl ow dampers Technical data Technical data Pressure and flow ranges and sound to the surroundings We reserve the right to make changes without prior notice