These are the tracks that the window moves up and down on
A home owner from Riverview, Florida says:
September 17, 2017
Hello,
Can you please tell me, based on the attached pictures, what channel guides I need to purchase to repair my windows.
On my window channels they say the word Caldwell with this: 29 3 DQ and they are 31 inches, end to end.
Tom from SWISCO responded:
September 20, 2017
Just measure the metal bar, not the whole assembly. If it's 30", then you need the S395-30. The 29 3 suggests to me that you need a 2930 option, for 16 to 23 pound window sashes.