Hi I work with actuators everyday, assembly, testing, etc. Here is our sales Center Info:
SKF USA Inc.
1530 Valley Center Parkway
Bethlehem, PA 18017
800-5413624
fax: 610-861-3737
Linear actuators - Products SKF Linear Motion United States
(Cat33 linear actuator) Quick delivery of custom actuators
Select the critical components: motors, gears, atttachments, etc.
1. SKF, very easy to build your own custom actuator, ask for a form or brochure. never called sale center but I sure they can help. The actuators are built in Grafton, WI
2. you will figure out the length you need
3. you will configure your actuator by the weight it needs to push. there are many solutions for height and speeds.
I'm guessing you have import precision/deftracing VLS. Well I think that you might have a problem with using a actuator because the door has to be opened before it can go up. Do some research its your project. Good Luck