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Depth of pocket should reflect the amount of stacking of the grille. The minimum stacking is calculated as follows: 1 1/4″ (32mm) per linear foot of closure + 3 1/4″ (83mm) for each vertical member nos. 2, 5, 6, 7, 8, 9, 10, 11, 12 and 7 1/2″ (190mm) for nos. 3 and 4. Width of pocket should be a minimum of 9″, with track on center.
