what is the proper/correct/best way to measure for side channels? I'm not quite sure how to compensate for the headrail and/or fascia (fabric wrapped); do you allow a gap between the bottom of the headrail/fascia? Do you take the height of the shade, as specified in SCT, and subtract a constant? Does the specified width of the shade change?
What is the "side channel deduct" value used for in SCT?
When installing a side channel, do you install the shade first in order to determine where exactly the shade will travel? Or install the side channel first?