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Walk through the process of developing a shoe boot.
The "shoe boot" (Figure 1) is typically found in ventilation work, primarily in the exhaust (suction) side, removing fumes or debris from worksites.
Practical Design of Exhaust and Blower Systems, written by E.W. Favalora in 1935, explains some of the history behind this fitting. In the chapter "Loss in branches or tees," it says: "Branches or tees entering a main at right angles to the flow of the main should never be installed." It says that this type of fitting should only be used in tight areas where there is insufficient space and installing a 45-degree piece of duct cannot be done.