Bob from SWISCO
Jun 5, 2019 9:20 am
EXPERT
Thanks for posting. This looks an older version of our Series 140 Coil Balance system. The number '19' might signify this is an S140-19, but I can't be certain. The best thing to would be to weigh your window sash. Dividing that exact weight in half will tell you how much support you need on both sides of the sash.
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