Linear Actuator for Greenhouse Vents and Skylights
Share this article
Greenhouse vents, roof windows, and small skylights often use a linear actuator to convert straight-line motion into a controlled opening angle. The correct actuator depends on the panel geometry, hinge position, wind exposure, stroke, and force at the worst opening position.
Start with the hinge geometry
Measure the distance from the hinge to the actuator attachment point and the distance from the hinge to the panel's center of mass. Record the fully closed and fully open positions. The panel angle does not directly tell you the actuator stroke.
Mounting close to the hinge may require more force. Mounting farther away can reduce force but may require more stroke and more installation space. Check the complete movement for binding and side loading.
When U1 or U2 may be a starting point
The HH-LA-U1 may be reviewed for a light vent or skylight with a favorable linkage and a protected installation. The HH-LA-U2 may be considered when the panel, linkage, or opening resistance requires a higher force class.
This is a screening direction, not an automatic fit. Wind can change the load substantially, especially when a roof panel is partly open. Calculate or test the required force at the most demanding position before choosing the product.
Outdoor environment and IP54
U1 and U2 are listed with IP54 protection. Protect the actuator body, cable entry, controller, and connectors from direct water paths and standing water. Provide drainage and inspection access. Do not describe IP54 as fully waterproof or as a substitute for enclosure design.
Control and ventilation planning
Decide whether the vent will be controlled by a switch, timer, thermostat, or another system. Verify voltage, current, polarity, end limits, and the behavior of the system during power loss. The actuator should not be used as the only structural stop for the panel.
Greenhouse vent checklist
- Panel weight and dimensions
- Hinge and actuator mounting positions
- Required opening angle
- Stroke and retracted-length clearance
- Wind and weather exposure
- Controller, wiring, and manual override
Choose the model only after the panel geometry and environment are understood. See HH-LA-U1 or see HH-LA-U2.
For a vent or skylight, evaluate panel area and wind-related loads, hinge geometry, required travel, installation space, duty cycle, and outdoor electrical protection.
Ready to Build Yours?
Greenhouse vents should open when heat builds, not when you remember. The HH-LA-U2 gives you 1500N in 12V/24V for $67.99 — plenty for vent panels and skylights. For harsher outdoor exposure, step up to the IP65 HH-LA-U11 instead. See both here: HH-LA-U2, HH-LA-U11. Send us your vent weight on WhatsApp and we will confirm the choice.