{"id":17792,"date":"2026-11-07T21:36:09","date_gmt":"2026-11-07T20:36:09","guid":{"rendered":"https:\/\/ventsystems.de\/haeufige-fehler-fensterantrieb-auswahl\/"},"modified":"2026-11-07T21:42:12","modified_gmt":"2026-11-07T20:42:12","slug":"common-mistakes-choosing-window-actuators","status":"publish","type":"post","link":"https:\/\/ventsystems.de\/en\/haeufige-fehler-fensterantrieb-auswahl\/","title":{"rendered":"10 common mistakes when choosing window actuators"},"content":{"rendered":"

In brief:<\/strong> Most problems with window actuators are not caused by the actuator itself but by the selection: too little thrust, too much stroke, only one actuator on a wide sash or no space on the frame. These are the ten mistakes we see most often in enquiries \u2013 each with a simple solution.<\/p>\n\n\n

1. Thrust calculated without reserve<\/h2>\n\n\n

If you size exactly to the calculated force, there is no margin left for wind, snow or stiff hardware. Plan a Reserve<\/a> : usually 30 %, for roof windows and exposed locations 50 %. The calculation is shown in the Window actuator calculator<\/a>.<\/p>\n\n\n

2. Sash weight and glass underestimated<\/h2>\n\n\n

Triple glazing or laminated safety glass makes a sash much heavier than expected. Calculate the Sash weight<\/a> from the area and Glazing build-up<\/a>instead of estimating it.<\/p>\n\n\n

3. Stroke larger than the stay allows<\/h2>\n\n\n

Tilt windows have a Tilt stay<\/a> or safety stay<\/a>, which limits the opening. If the Stroke length<\/a> of the actuator is larger, it pushes against the hardware. Always choose the stroke to suit the stay.<\/p>\n\n\n

4. Wide sash with only one actuator<\/h2>\n\n\n

From a sash width of about 1.5 m the sash twists if it is only pushed in the middle. In that case use two actuators in tandem operation<\/a> with Synchronous control<\/a> .<\/p>\n\n\n

5. Mounting position and space not checked<\/h2>\n\n\n

Actuator and Bracket<\/a> need space on the outer frame. Check the Mounting position<\/a> (frame or sash, top or side) before ordering \u2013 photos of the window help us advise you.<\/p>\n\n\n

6. Power supply and cable too small<\/h2>\n\n\n

Several 24 V actuators on a weak power supply or a thin, long cable run slowly or not at all. Calculate the demand with the power supply calculator<\/a>; the cable cross-section is shown in the Window actuator calculator<\/a>.<\/p>\n\n\n

7. No protection against wind and rain<\/h2>\n\n\n

An open roof window in a thunderstorm costs more than any sensor. A Wind monitor<\/a> or Rain sensor<\/a> closes the windows automatically.<\/p>\n\n\n

8. Windows within reach without protection<\/h2>\n\n\n

Where people can reach the window, there is a risk of trapping at the closing edges<\/a> . Automation there only with protective measures or with operation where someone watches the movement.<\/p>\n\n\n

9. Locked window with chain actuator<\/h2>\n\n\n

A chain actuator cannot open a locked sash. If the window is to stay locked, you need a Locking drive<\/a>that unlocks before opening.<\/p>\n\n\n

10. Ventilation and smoke exhaust confused<\/h2>\n\n\n

An actuator for daily ventilation is not automatically a smoke exhaust system. Smoke and heat exhaust is planned project by project and requires tested components and a SHEV control panel. The difference is explained in the article SHEV and NSHEV<\/a>.<\/p>\n\n\n

Checklist before ordering<\/h2>\n\n\n