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At the point where operable sash meet, the interlocking design of the meeting rail or stile secures sash tightly together.

Double Hung windows
feature a vent latch
for partial ventilation.

Windows with operable sash move smoothly and easily because of a
constant force coil spring
balance system.

A spacer system with a U-channel design inside the I.G. is more efficient than conventional box spacers.

Low-profile composite cam lock blends into the overall window design.