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The window is mounted to the exterior wall with two M3 studs (item 2) and hex nuts. The PCB is installed above the window onto four M3x6mm standoffs (item 3) and screws. Use minimum 6mm standoffs provide adequate space for components under the PCB. Avoid using long standoffs in order to keep the antenna as close to the window as possible for wireless signal strength. The 27.89mm dimension is critical. It sets the location of the window to the PCB.
Solidworks model for example cabinet wall.
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