Angled, exterior view of a house with off-white vinyl siding. Twin, double hune replacement windows, with colonial grids, in white. Evergreen hedges.

How do Sash Windows Stay Open?

The Evolution of Window Counterbalance Systems

Cord and Weights

Old, window chain and pulley system used to keep windows open.The simple answer is, physics. Window manufacturers figured out long ago that by engineering a counterbalance system into the design the window will stay open at the desired height. In windows,

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