replacement channels

A home owner from hudson, florida says:
the overall dimentions of the window is 51.5" wide 60" high
the channel's only stamp is (28c)
not sure on the weight load
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Casey from SWISCO responded:

Thanks for posting!

It looks like you'll need the S380-29. Just be sure your balance measures 29" and the bottom shoe has a depth of 1". As long as everything checks out, go for the S380-29 with the 2830 option that corresponds with your 28C stamp.

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