Paul from SWISCO responded:
June 19, 2015
To replace the window screen, you will first need to remove your bottom sash. The design of the screen itself should be simple. It will be a white 3/8" thick box screen with springs (like our 70-030) on top and pulls (like our 70-128) on bottom. When measuring, the width will be the widest you can go without bowing the screen in frame resting against the outside frame. To measure the height, stick a ruler into the inside of the top channel and bring the ruler down to the sill, though don't go into the bottom channel. That way you can slip screen into the top channel, swing it out, and drop it in the bottom channel.
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