Required actuator torque
After obtaining the damper torque rating [Nm/m2] from the manufacturer and determining the damper area, calculate the total torque required to move the damper as follows:
Total torque [Nm] = Torque rating [Nm/m2] × damper area [m2].
Instead of the torque rating, the total torque can also be determined from the manufacturer's sizing diagrams.
Sizing diagram
The following diagram (example EMCO) allows for determining the total torque for this air damper type.
Example
Damper for blinds:
Width = 800 mm
Height = 1005 mm
Total pressure = 1000 Pa
The total torque of about 5 Nm results from the diagram.
Determining the actuator type
Determine your type of actuator from the table below:
If  |
then use type (with spring return) |
| ≤ 7 Nm |
|
| ≤ 14 Nm |
|
| ≤ 18 Nm |
|
| ≤ 36 Nm |
|
Notes
1 Safety Factor SF:
When calculating the number of actuators, remember to include non-definable variables such as slight misalignment, damper age, etc. as a safety factor.
We recommend a total safety factor of 0.8.
Apply the same factor when calculating the actuator torque by the torque rating.
If the required actuator torque is greater than 7 Nm, the following can be used:
2 Two actuators (tandem-mounted "powerpack") of type series GMA12..1, GMA32..1, GMA13..1
3 one actuator of type series GCA...1.
4 If the actuator torque is greater than 18 Nm, two actuators of type series GCA...1 can mechanically be connected and mounted on the damper shaft.