This item has become Discontinued
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Larson Performance Double Hung 3-Track Storm Window with Clear Glass
Storm Windows are sold by the United Inch ( UI )
Round up to the nearest whole inch on width and height, add together to get the UI
Maximum window size is 20 SF, For larger windows see Premium series
Exact with Expander
Exact, No Expander
Oriel / Cottage windows require a measurement from the top of window to center of Meeting Rail.