Constant/variable flow dampers
DAU, DA2EU, DAVU
Assembly
In order to fulfil the requirements for air-tightness class D, the devices must be installed as per ‘Assembly Instruction
Lindab Safe’.
The devices must be installed with the air flow in the direction of the arrow.
The devices allow 50 mm duct insulation without the scale or any motor being hidden.
Pressure range
50–1000 Pa over the unit.
Interference sensitivity
In order to achieve stated precision for the set flow, a straight duct of at least 3×d before and 1.5×d after the devices is
required. A assembly close to a source of interference (bend, saddle, etc.) reduces control accuracy and the flow can
deviate from the set value.
Changes in direction
The units are independent of their direction of installation; you can deviate from the projected direction and install them
in any direction you like without affecting accuracy.
Systematic error
Control accuracy
The devices are calibrated within their entire operating range at the factory. This means the devices keep the flow con-
stant to within approx. ±5 to ±10 % of the set flow. Larger deviations occur at lower flows, especially with small sizes.
Maintenance
The devices normally don't require any maintenance, but should be protected from contaminated air wherever possible.
CE marking
Our dampers with electrical actuator are regarded as a component in the duct system and does not need to be CE
marked separately.
Their electrical actuators on the other hand are part of the electrical system and are CE marked. Declaration of compli-
ance with the essential requirements can be found at www.belimo.ch .
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