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Parameters(28V DC/600N)
Cut-off current:  700mA
 Speed:  2.8mm/s(14s)
 Average moving interval:  30%
Signal output:  24V DC,50mA
Specifications
 Rated voltage:  24V DC(-20%/+35%)
Rated thrust:  600N(1000N when start)
Stroke:  2x19mm(optional)
Emergency
Lose latch :  About 600N

   This integrated asynchronous electric windows tuner is suitable for 24V DC motors with built-in endpoint shutdown latch (up to 3A, continuous running time of less than 3 minutes). Window latch can be installed on the surface or inside the window frames. The meshing point of window hook can be located on either side of the window and the specific location is optional. Wires are connected by connectors. There are two outputs on the open and the close signal. The moving distance of the window is optional(36mm or 17mm).The unlocking accessories for emergency situations is optional. 
 

Hung window push and pull rally formula
The necessary push pull F (N) = Window gravity G (N) / 2 × open stroke C (m) / sash height H (m)
Which: sash gravity G (N) = sash mass (kg) × 9.8 (N / kg)
Weight =sash width W (m) × sash high H (m) × glass thickness (m) × 2.5 (kg / m) × 1.2
Fire and smoke exhaust windows opening angle of the relevant area of the state by requiring
The Building exhaust area of ≥ 2% of interior space.
Exhaust area calculation:
Smoke Area (m) = sash width W (m) × Open Stroke C (m) + sash high-H (m) × Open Stroke C (m)
Power flow area (m) = sash width W ( m) × sash high-H (m) × flow coefficient