Tom from SWISCO responded:
November 2, 2017
Hello! Sometimes the 28D corresponds to our 2840 (D being the fourth letter of the alphabet), meaning that 28C would be 2830 and 28F would be 2860. However, this isn't always the case. The only way to be sure is to remove your window sash, weigh it, and check the chart in the S380-29 product description.
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