The PZP compares the floor area a certain distance from the facade to the total floor area. So for example, if you set the range to be 6 meters, then it will calculate the total % floor area that is 6 meters from the facade. This area of the floor is called the passive zone, since it has the potential to be passively lit and ventilated.
Usually, the depth passive zone is assumed to be twice the floor to ceiling height. So if your space if 4 meters hight, the passive zone is the floor area 8 meters from the facade.
The node is a bit more flexible, and it allows you to enter multiple ranges. For example, if you enter "3, 6, 9", then it will calculate 4 values: 1) the percentage floor area between 0 and 3 meters from the facade, 2) the percentage between 3 and 6 meters, 3) the percentage between 6 and 9 meters, and 4) the percentage above 9 meters.
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