I have a door that weighs 500 lbs. It raises up 90 degrees on an arc. It uses an electric actuator to pull on the lever to raise the door and push to lower. I am modifying the door and do not know how to calculate the force to make sure I have the right actuator. I currently use a 1500 lb actuator.

I need to modify a Lever 1 formula F1 = (W x X)/L because the door opens vertically without lifting back.
Should I add to F1 a force from: either Fy= sin A * F1 or Fx = cos A * F1 or square root of Fx+Fy or there is other solution?

Here is a simular door on Box Furnace 'Bulletin FH-750' to what I need to find a formulas
http://www.sakav.com/Products/Muffle%20Furnaces/BoxFurnaces.htm