I have an Anderson Venting Roof Window in my attic that I'd like to get through for some roof access. I believe it is an RV model, as seen on pg 11 of this Anderson parts catalog

I've removed the operator cover, but I can't see a way to disengage the operator arm from the sash. There is a slot in the center of the sash rail that it appears the arm shoes should fit through, but there is no play in the arms to move to that position.

I even removed the center screw (was in the dark hole at the base of the two arms) but that didn't give any additional play whatsoever.

Below is a picture of the window fully open (approx. 8 inches). How can I get the window open further?

Anderson Venting Roof Window, fully open

  • can you move one arm to center?
    – jsotola
    Apr 16, 2020 at 1:54
  • @jsotola - No, that's just it - it looks like I should be able to, but there is just not enough play. I've tried with it full open, as shown in the picture, and slightly less open, in case a little space between the arms would help. I can only get them over maybe a half inch, but not near enough to the gap in the center.
    – Randall
    Apr 16, 2020 at 15:17
  • all i can think of, is that pulling the crank somehow disengages the gears inside the device and allows the arms to swing independently
    – jsotola
    Apr 16, 2020 at 15:52
  • Nope - pulling the crank handle off just exposes the grooved axle that turns the gears. The so-called operator seems to be a single piece that can't be disassembled at all.
    – Randall
    Apr 16, 2020 at 20:41
  • Where the arms connect to the black sliding bracket, Can you pull the arm away ( down for the one on the right and up for the left ) from the bracket thereby pulling the pivot pin out of the black bracket ? What is the function of the springs and does disconnecting them do anything?
    – Alaska Man
    Apr 16, 2020 at 20:52


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