Measurements must be taken on both the inside and the outside of
To measure Daylight Opening (DLO), measure the
visible glass, from stop to stop.
To measure the Tip-to-Tip dimension, measure
the longest part of the grille on the top of the profile (the
portion that faces outward from the glass).
To measure the Underneath dimension, measure
the shortest part of the grille bar on the bottom of the profile
(the portion that touches the glass).
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