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TI-08-03

AAMA/WDMA/CSA TI-08-03-AAMA/WDMA 101/I.S.2/NAFS-02, AAMA/WDMA/CSA 101/I.S.2/A440-05 & AAMA/WDMA/CSA 101/I.S.2/A440-08; Structural Testing Equivalency

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Interpretation Requested:

1. When limited to a two-lite-high single hung window, if a manufacturer provides supporting engineering analysis prepared by a Structural Engineer and follows acceptable engineering practice that indicates loading (i.e. wind load, dead load, point load and deflection due to flexural loading) is equivalent or reduced on load bearing components, does structural testing of an "even split" unit qualify an "un-even split" unit when the lower portion is less than H/2 and the overall frame size of the "un-even split" unit is equal to or less than that of the "even split" unit?

2. When limited to a two-lite-wide OX or XO horizontal sliding window, if a manufacturer provides supporting engineering analysis prepared by a Structural Engineer and follows acceptable engineering practice that indicates loading (i.e. wind load, dead load, point load and deflection due to flexural loading) is equivalent or reduced on load bearing components, does structural testing of an "even split" unit qualify an "un-even split" unit when one portion is less than W/2 and the overall frame size of the "un-even split" unit is equal to or less than that of the "even split" unit?

Date of Inquiry: December 18, 2008

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