The pass-thru window assembly is secured using 1-1/2 by 1-1/2 inch steel angles per manufacturer recommendations. Backing type B is provided per each side at top and bottom. Four number 10 sheet metal screws fasten the frame top and bottom, with three number 10 sheet metal screws secured on each side.
L1 1/2x1 1/2x PER MFR BACKING TYPE B PER EA SIDE T&B (4)#10 SMS T&B (3)#10 SMS EA SIDE
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